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10d+3d-5d-2d+3d=18
We move all terms to the left:
10d+3d-5d-2d+3d-(18)=0
We add all the numbers together, and all the variables
9d-18=0
We move all terms containing d to the left, all other terms to the right
9d=18
d=18/9
d=2
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