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18=15d+3d-8
We move all terms to the left:
18-(15d+3d-8)=0
We add all the numbers together, and all the variables
-(18d-8)+18=0
We get rid of parentheses
-18d+8+18=0
We add all the numbers together, and all the variables
-18d+26=0
We move all terms containing d to the left, all other terms to the right
-18d=-26
d=-26/-18
d=1+4/9
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