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7d=-17.5
We move all terms to the left:
7d-(-17.5)=0
We add all the numbers together, and all the variables
7d+17.5=0
We move all terms containing d to the left, all other terms to the right
7d=-17.5
d=-17.5/7
d=-2+2.3333333333333/4.6666666666667
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