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15d+2d-10d-7d+3d=15
We move all terms to the left:
15d+2d-10d-7d+3d-(15)=0
We add all the numbers together, and all the variables
3d-15=0
We move all terms containing d to the left, all other terms to the right
3d=15
d=15/3
d=5
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