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-27=-6+2d
We move all terms to the left:
-27-(-6+2d)=0
We add all the numbers together, and all the variables
-(2d-6)-27=0
We get rid of parentheses
-2d+6-27=0
We add all the numbers together, and all the variables
-2d-21=0
We move all terms containing d to the left, all other terms to the right
-2d=21
d=21/-2
d=-10+1/2
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