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-7(d+-1)=-56
We move all terms to the left:
-7(d+-1)-(-56)=0
We add all the numbers together, and all the variables
-7(d-1)-(-56)=0
We add all the numbers together, and all the variables
-7(d-1)+56=0
We multiply parentheses
-7d+7+56=0
We add all the numbers together, and all the variables
-7d+63=0
We move all terms containing d to the left, all other terms to the right
-7d=-63
d=-63/-7
d=+9
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