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12d+18=4+5d
We move all terms to the left:
12d+18-(4+5d)=0
We add all the numbers together, and all the variables
12d-(5d+4)+18=0
We get rid of parentheses
12d-5d-4+18=0
We add all the numbers together, and all the variables
7d+14=0
We move all terms containing d to the left, all other terms to the right
7d=-14
d=-14/7
d=-2
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