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6d-15=4d+15
We move all terms to the left:
6d-15-(4d+15)=0
We get rid of parentheses
6d-4d-15-15=0
We add all the numbers together, and all the variables
2d-30=0
We move all terms containing d to the left, all other terms to the right
2d=30
d=30/2
d=15
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