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12-19d=-18d
We move all terms to the left:
12-19d-(-18d)=0
We get rid of parentheses
-19d+18d+12=0
We add all the numbers together, and all the variables
-1d+12=0
We move all terms containing d to the left, all other terms to the right
-d=-12
d=-12/-1
d=+12
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