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-d-8=-2d-18
We move all terms to the left:
-d-8-(-2d-18)=0
We add all the numbers together, and all the variables
-1d-(-2d-18)-8=0
We get rid of parentheses
-1d+2d+18-8=0
We add all the numbers together, and all the variables
d+10=0
We move all terms containing d to the left, all other terms to the right
d=-10
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