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18=4d-3
We move all terms to the left:
18-(4d-3)=0
We get rid of parentheses
-4d+3+18=0
We add all the numbers together, and all the variables
-4d+21=0
We move all terms containing d to the left, all other terms to the right
-4d=-21
d=-21/-4
d=5+1/4
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