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6(2d-3.5)=-25.5-7d
We move all terms to the left:
6(2d-3.5)-(-25.5-7d)=0
We add all the numbers together, and all the variables
6(2d-3.5)-(-7d-25.5)=0
We multiply parentheses
12d-(-7d-25.5)-21=0
We get rid of parentheses
12d+7d+25.5-21=0
We add all the numbers together, and all the variables
19d+4.5=0
We move all terms containing d to the left, all other terms to the right
19d=-4.5
d=-4.5/19
d=-3/12.6666666667
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