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-7(15-d)=56
We move all terms to the left:
-7(15-d)-(56)=0
We add all the numbers together, and all the variables
-7(-1d+15)-56=0
We multiply parentheses
7d-105-56=0
We add all the numbers together, and all the variables
7d-161=0
We move all terms containing d to the left, all other terms to the right
7d=161
d=161/7
d=23
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