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-30-9d=6(3d+4)
We move all terms to the left:
-30-9d-(6(3d+4))=0
We calculate terms in parentheses: -(6(3d+4)), so:We get rid of parentheses
6(3d+4)
We multiply parentheses
18d+24
Back to the equation:
-(18d+24)
-9d-18d-24-30=0
We add all the numbers together, and all the variables
-27d-54=0
We move all terms containing d to the left, all other terms to the right
-27d=54
d=54/-27
d=-2
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