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3d(d-3)+5(d+7)-d(d+1)-2d(d-3)+4=0
We multiply parentheses
3d^2-d^2-2d^2-9d+5d-d+6d+35+4=0
We add all the numbers together, and all the variables
d+39=0
We move all terms containing d to the left, all other terms to the right
d=-39
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