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12d=81-16d
We move all terms to the left:
12d-(81-16d)=0
We add all the numbers together, and all the variables
12d-(-16d+81)=0
We get rid of parentheses
12d+16d-81=0
We add all the numbers together, and all the variables
28d-81=0
We move all terms containing d to the left, all other terms to the right
28d=81
d=81/28
d=2+25/28
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