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12d+4=5d+14
We move all terms to the left:
12d+4-(5d+14)=0
We get rid of parentheses
12d-5d-14+4=0
We add all the numbers together, and all the variables
7d-10=0
We move all terms containing d to the left, all other terms to the right
7d=10
d=10/7
d=1+3/7
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