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4d=-6d+80
We move all terms to the left:
4d-(-6d+80)=0
We get rid of parentheses
4d+6d-80=0
We add all the numbers together, and all the variables
10d-80=0
We move all terms containing d to the left, all other terms to the right
10d=80
d=80/10
d=8
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