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15+7y=10y+3
We move all terms to the left:
15+7y-(10y+3)=0
We get rid of parentheses
7y-10y-3+15=0
We add all the numbers together, and all the variables
-3y+12=0
We move all terms containing y to the left, all other terms to the right
-3y=-12
y=-12/-3
y=+4
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