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Solve for y. 1/3 (y-7.50x2)= 40

What I have so far: 
 
1/3 (y-7.50 x2) = 40
1/3 (y-15)= 40
 
I am not sure of the next step,
 
y-15 =40= y-5 = 13.33
 3        3
 
 Or
 
1/3(y-15 +15)=40 + 15
1/3(y) = 55
 
 Any help would be appreciated :))
 
 
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2 Answers

I agree
 
1/3(y -15) = 40
1/3y - 15/3 = 40  be careful of the sign !!!
1/3y -5 = 40
1/3y = 40 + 5
1/3y = 45
  y = 45 x 3
  y = 135 
Hi Pj,
 
1/3(y-7.50x2)=40
1/3(y-15)=40.  This step is correct, simplify within the parentheses.
your next step is not correct because EVERYTHING  on the left side of the equation is multiplied by 1/3 and you just multiplied 15 by 1/3, so.....
3(1/3(y-15))=3(40). I would multiply both sides of the equation by 3 to eliminate the fraction giving you.....
y-15 =120. Makes it whole numbers and easier to solve
y-15 +15 = 120 +15. Perform the opposite operation to the whole number to isolate the variable 
y = 135. Simplify and you get your solution