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12=3(y-13)
We move all terms to the left:
12-(3(y-13))=0
We calculate terms in parentheses: -(3(y-13)), so:We get rid of parentheses
3(y-13)
We multiply parentheses
3y-39
Back to the equation:
-(3y-39)
-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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