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12=8d+4
We move all terms to the left:
12-(8d+4)=0
We get rid of parentheses
-8d-4+12=0
We add all the numbers together, and all the variables
-8d+8=0
We move all terms containing d to the left, all other terms to the right
-8d=-8
d=-8/-8
d=1
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