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8=5d-12=13
We move all terms to the left:
8-(5d-12)=0
We get rid of parentheses
-5d+12+8=0
We add all the numbers together, and all the variables
-5d+20=0
We move all terms containing d to the left, all other terms to the right
-5d=-20
d=-20/-5
d=+4
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