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15+3y=y+35
We move all terms to the left:
15+3y-(y+35)=0
We get rid of parentheses
3y-y-35+15=0
We add all the numbers together, and all the variables
2y-20=0
We move all terms containing y to the left, all other terms to the right
2y=20
y=20/2
y=10
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