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20+6d=-4+12d
We move all terms to the left:
20+6d-(-4+12d)=0
We add all the numbers together, and all the variables
6d-(12d-4)+20=0
We get rid of parentheses
6d-12d+4+20=0
We add all the numbers together, and all the variables
-6d+24=0
We move all terms containing d to the left, all other terms to the right
-6d=-24
d=-24/-6
d=+4
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