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12+8(-9d+15)=-2(-19d-11)
We move all terms to the left:
12+8(-9d+15)-(-2(-19d-11))=0
We multiply parentheses
-72d-(-2(-19d-11))+120+12=0
We calculate terms in parentheses: -(-2(-19d-11)), so:We add all the numbers together, and all the variables
-2(-19d-11)
We multiply parentheses
38d+22
Back to the equation:
-(38d+22)
-72d-(38d+22)+132=0
We get rid of parentheses
-72d-38d-22+132=0
We add all the numbers together, and all the variables
-110d+110=0
We move all terms containing d to the left, all other terms to the right
-110d=-110
d=-110/-110
d=1
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