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36=8d+12
We move all terms to the left:
36-(8d+12)=0
We get rid of parentheses
-8d-12+36=0
We add all the numbers together, and all the variables
-8d+24=0
We move all terms containing d to the left, all other terms to the right
-8d=-24
d=-24/-8
d=+3
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