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8d-4=2(1+d)
We move all terms to the left:
8d-4-(2(1+d))=0
We add all the numbers together, and all the variables
8d-(2(d+1))-4=0
We calculate terms in parentheses: -(2(d+1)), so:We get rid of parentheses
2(d+1)
We multiply parentheses
2d+2
Back to the equation:
-(2d+2)
8d-2d-2-4=0
We add all the numbers together, and all the variables
6d-6=0
We move all terms containing d to the left, all other terms to the right
6d=6
d=6/6
d=1
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