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50=5y+15
We move all terms to the left:
50-(5y+15)=0
We get rid of parentheses
-5y-15+50=0
We add all the numbers together, and all the variables
-5y+35=0
We move all terms containing y to the left, all other terms to the right
-5y=-35
y=-35/-5
y=+7
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