What is x+5=-7

Question

help me!!! Please 

Also, what is What is 3/4(4/5x-2)=11/4?

Answer 1

(For the question posted as the title)

X + 5 = - 7

You have:

X + 5 - 5 = - 7 - 5 (subtracting 5 from both sides to isolate X)

X = -12

 

(For the second question)

So for this one, you first cancel out the 3/4 by multiplying both sides by 4

3/4 * 4 * (4/5x - 2) = 11/4 * 4

3 * (4/5X - 2) = 11

Then dividing by 3

3 / 3 * (4/5X - 2) = 11 / 3

(4/5X - 2) = 11 / 3

 

So here, I'm not sure if it's supposed to be (4/5)X - 2 = 11 / 3 or 4/(5X) - 2 = 11 / 3, so I'll solve it both ways to be safe. (first case, X is in the numerator; second case, X is in the denominator)

Assuming it is (4/5)X - 2 = 11 / 3

First add 2 to both sides to isolate the (4/5)X

(4/5)X - 2 + 2 = 11 / 3 + 2

(4/5)X = 11 / 3 + 2

Find a common denominator for the right hand side

(4/5)X = 11 / 3 + 6 / 3

(4/5)X = 17 / 3

Now cancel out the 4/5 on the right hand side by first multiplying both side by 5

(4/5)X * 5 = (17 / 3) * (5 / 1)

4X = 85 / 3

Divide both sides by 4

4X/4 = (85 / 3) / 4

X = 85 / 12

 

Assuming it is 4/(5X) - 2 = 11 / 3

Start again by adding 2 to both sides

(4/5)X - 2 + 2 = 11 / 3 + 2

4/(5X) = 11 / 3 + 2

Find a common demonimator

4/(5X) = 11 / 3 + 6 / 3

4/(5X) = 17 / 3

Multiply both sides by 5X

4/(5X) * 5X = 17 / 3 * 5X

4 = 85X / 3

Multiply both sides by 3

4 * 3 = (85X / 3) * 3

12 = 85X

Divide both sides by 85

12 /85 = 85X / 85

X = 12 / 85