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0=8+2d
We move all terms to the left:
0-(8+2d)=0
We add all the numbers together, and all the variables
-(2d+8)+0=0
We add all the numbers together, and all the variables
-(2d+8)=0
We get rid of parentheses
-2d-8=0
We move all terms containing d to the left, all other terms to the right
-2d=8
d=8/-2
d=-4
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