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12+18.75d=24d
We move all terms to the left:
12+18.75d-(24d)=0
We add all the numbers together, and all the variables
-5.25d+12=0
We move all terms containing d to the left, all other terms to the right
-5.25d=-12
d=-12/-5.25
d=2+1/3.5
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