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40-3.25d=3d+9.5
We move all terms to the left:
40-3.25d-(3d+9.5)=0
We get rid of parentheses
-3.25d-3d-9.5+40=0
We add all the numbers together, and all the variables
-6.25d+30.5=0
We move all terms containing d to the left, all other terms to the right
-6.25d=-30.5
d=-30.5/-6.25
d=4+3.66666666667/4.16666666667
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