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5(d-84)=8
We move all terms to the left:
5(d-84)-(8)=0
We multiply parentheses
5d-420-8=0
We add all the numbers together, and all the variables
5d-428=0
We move all terms containing d to the left, all other terms to the right
5d=428
d=428/5
d=85+3/5
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