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20-10d=-18-12d+4d
We move all terms to the left:
20-10d-(-18-12d+4d)=0
We add all the numbers together, and all the variables
-10d-(-8d-18)+20=0
We get rid of parentheses
-10d+8d+18+20=0
We add all the numbers together, and all the variables
-2d+38=0
We move all terms containing d to the left, all other terms to the right
-2d=-38
d=-38/-2
d=+19
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