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-3y=10y+7
We move all terms to the left:
-3y-(10y+7)=0
We get rid of parentheses
-3y-10y-7=0
We add all the numbers together, and all the variables
-13y-7=0
We move all terms containing y to the left, all other terms to the right
-13y=7
y=7/-13
y=-7/13
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