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56.25=7.5d
We move all terms to the left:
56.25-(7.5d)=0
We add all the numbers together, and all the variables
-(+7.5d)+56.25=0
We get rid of parentheses
-7.5d+56.25=0
We move all terms containing d to the left, all other terms to the right
-7.5d=-56.25
d=-56.25/-7.5
d=7+2.14285714286/4.28571428571
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