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18d+234=6d-78
We move all terms to the left:
18d+234-(6d-78)=0
We get rid of parentheses
18d-6d+78+234=0
We add all the numbers together, and all the variables
12d+312=0
We move all terms containing d to the left, all other terms to the right
12d=-312
d=-312/12
d=-26
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