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-12=2(d+13)
We move all terms to the left:
-12-(2(d+13))=0
We calculate terms in parentheses: -(2(d+13)), so:We get rid of parentheses
2(d+13)
We multiply parentheses
2d+26
Back to the equation:
-(2d+26)
-2d-26-12=0
We add all the numbers together, and all the variables
-2d-38=0
We move all terms containing d to the left, all other terms to the right
-2d=38
d=38/-2
d=-19
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