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13=2y-39(y+4)
We move all terms to the left:
13-(2y-39(y+4))=0
We calculate terms in parentheses: -(2y-39(y+4)), so:We get rid of parentheses
2y-39(y+4)
We multiply parentheses
2y-39y-156
We add all the numbers together, and all the variables
-37y-156
Back to the equation:
-(-37y-156)
37y+156+13=0
We add all the numbers together, and all the variables
37y+169=0
We move all terms containing y to the left, all other terms to the right
37y=-169
y=-169/37
y=-4+21/37
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