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8=4d-12
We move all terms to the left:
8-(4d-12)=0
We get rid of parentheses
-4d+12+8=0
We add all the numbers together, and all the variables
-4d+20=0
We move all terms containing d to the left, all other terms to the right
-4d=-20
d=-20/-4
d=+5
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