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15=3y+7.y=
We move all terms to the left:
15-(3y+7.y)=0
We add all the numbers together, and all the variables
-(+10y)+15=0
We get rid of parentheses
-10y+15=0
We move all terms containing y to the left, all other terms to the right
-10y=-15
y=-15/-10
y=1+1/2
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