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(15-y)+2y=28
We move all terms to the left:
(15-y)+2y-(28)=0
We add all the numbers together, and all the variables
(-1y+15)+2y-28=0
We add all the numbers together, and all the variables
2y+(-1y+15)-28=0
We get rid of parentheses
2y-1y+15-28=0
We add all the numbers together, and all the variables
y-13=0
We move all terms containing y to the left, all other terms to the right
y=13
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