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d-9(2d-10)=-9d+10
We move all terms to the left:
d-9(2d-10)-(-9d+10)=0
We multiply parentheses
d-18d-(-9d+10)+90=0
We get rid of parentheses
d-18d+9d-10+90=0
We add all the numbers together, and all the variables
-8d+80=0
We move all terms containing d to the left, all other terms to the right
-8d=-80
d=-80/-8
d=+10
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