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15d+4=7d+68
We move all terms to the left:
15d+4-(7d+68)=0
We get rid of parentheses
15d-7d-68+4=0
We add all the numbers together, and all the variables
8d-64=0
We move all terms containing d to the left, all other terms to the right
8d=64
d=64/8
d=8
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