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7.5=2d-1.5
We move all terms to the left:
7.5-(2d-1.5)=0
We get rid of parentheses
-2d+1.5+7.5=0
We add all the numbers together, and all the variables
-2d+9=0
We move all terms containing d to the left, all other terms to the right
-2d=-9
d=-9/-2
d=4+1/2
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