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12=-4+d
We move all terms to the left:
12-(-4+d)=0
We add all the numbers together, and all the variables
-(d-4)+12=0
We get rid of parentheses
-d+4+12=0
We add all the numbers together, and all the variables
-1d+16=0
We move all terms containing d to the left, all other terms to the right
-d=-16
d=-16/-1
d=+16
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