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-18+6d+2d=2+7d
We move all terms to the left:
-18+6d+2d-(2+7d)=0
We add all the numbers together, and all the variables
6d+2d-(7d+2)-18=0
We add all the numbers together, and all the variables
8d-(7d+2)-18=0
We get rid of parentheses
8d-7d-2-18=0
We add all the numbers together, and all the variables
d-20=0
We move all terms containing d to the left, all other terms to the right
d=20
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