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15d+3d-18d-12d+2d=14
We move all terms to the left:
15d+3d-18d-12d+2d-(14)=0
We add all the numbers together, and all the variables
-10d-14=0
We move all terms containing d to the left, all other terms to the right
-10d=14
d=14/-10
d=-1+2/5
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