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-12=-4+4d
We move all terms to the left:
-12-(-4+4d)=0
We add all the numbers together, and all the variables
-(4d-4)-12=0
We get rid of parentheses
-4d+4-12=0
We add all the numbers together, and all the variables
-4d-8=0
We move all terms containing d to the left, all other terms to the right
-4d=8
d=8/-4
d=-2
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