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-3(y-13)=-12
We move all terms to the left:
-3(y-13)-(-12)=0
We add all the numbers together, and all the variables
-3(y-13)+12=0
We multiply parentheses
-3y+39+12=0
We add all the numbers together, and all the variables
-3y+51=0
We move all terms containing y to the left, all other terms to the right
-3y=-51
y=-51/-3
y=+17
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