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8=2(d-8)-(-4)
We move all terms to the left:
8-(2(d-8)-(-4))=0
We calculate terms in parentheses: -(2(d-8)-(-4)), so:We get rid of parentheses
2(d-8)-(-4)
We add all the numbers together, and all the variables
2(d-8)+4
We multiply parentheses
2d-16+4
We add all the numbers together, and all the variables
2d-12
Back to the equation:
-(2d-12)
-2d+12+8=0
We add all the numbers together, and all the variables
-2d+20=0
We move all terms containing d to the left, all other terms to the right
-2d=-20
d=-20/-2
d=+10
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