step by step solve equation

0.1 (w + 0.5) + 0.2w = 0.2(w - 0.4);

0.1w + 0.05 + 0.2w = 0.2w - 0.08;

0.1w + 0.05 = -0.08;

0.1w = -0.13;

w = -1.3

step by step solve equation

Tutors, please sign in to answer this question.

0.1 (w + 0.5) + 0.2w = 0.2(w - 0.4);

0.1w + 0.05 + 0.2w = 0.2w - 0.08;

0.1w + 0.05 = -0.08;

0.1w = -0.13;

w = -1.3

Just wanted to point something extra out. This really is just my own personal preference but its something to look out for that
* I think* can make this problem a bit easier. Multiply every term by 10, which is to say the move the decimal places once to the right.

(10)0.1(w+0.5) +(10)0.2w =(10)0.2 (w-0.4)

w + 0.5 + 2w = 2(w-0.4)

Now, you're only dealing with one decimal place instead of two (0.05), the 0.1w and 0.2w are gone. It works because every term has a number whose sole digit has a place value of one tenth. The answer won't change but I feel that its easier to work with as many integers as possible.

First, we check to see if there is anything that can be done within the parenthesis (remember PEMDAS). Since there isn't, we move to distributing everything on both sides of the equation.

- 0.1(w + 0.5) + 0.2w = 0.2(w - 0.4)
- 0.1(w) + 0.1(0.5) + 0.2w = 0.2(w) + 0.2(-0.4)
- 0.1w + 0.05 + 0.2w = 0.2w - 0.08

Next, we combine like terms on both sides of the equation. Then we isolate the variables on one side and the numerical values on the other, adding/subtracting as necessary.

- (rewrite) 0.1w + 0.2w +0.05 = 0.2w - 0.08
- 0.3w + 0.05 = 0.2w - 0.08
- 0.3w
**- 0.2w**+ 0.05 - 0.05 = 0.2w - 0.2w - 0.08**- 0.05** - 0.1w = -0.13

Finally, we divide out the coefficient on the variable on both sides of the equation, and we're done.

- 0.1w/0.1 = -0.13/0.1
- w = -1.3

If you like, let's double check by substituting our answer into the original equation and see if the sides match.

- 0.1(-1.3 + 0.5) + 0.2(-1.3) = 0.2(-1.3 - 0.4)
- 0.1(-0.8) + 0.2(-1.3) = 0.2(-1.7)
- -0.08 - 0.26 = -0.34
- -0.34 = -0.34 :)

John Z.

Chemistry, Physics, SAT Math, and Calculus Tutor; CU Chemical Engineer

Brooklyn, NY

5.0
(305 ratings)

Larry G.

Algebra/Geometry/SAT Tutor

Bronx, NY

4.9
(141 ratings)

Ronniel M.

Making Math Easy- SAT Prep, Algebra, Precalculus, English, Spanish

Clifton, NJ

5.0
(152 ratings)