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5d-7.5d=-18.5
We move all terms to the left:
5d-7.5d-(-18.5)=0
We add all the numbers together, and all the variables
-2.5d+18.5=0
We move all terms containing d to the left, all other terms to the right
-2.5d=-18.5
d=-18.5/-2.5
d=7+1/2.5
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