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-8.5d-7.5+3.5d=44.25
We move all terms to the left:
-8.5d-7.5+3.5d-(44.25)=0
We add all the numbers together, and all the variables
-5d-51.75=0
We move all terms containing d to the left, all other terms to the right
-5d=51.75
d=51.75/-5
d=-10+1/2.8571428571429
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