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2d+18=-20+4d
We move all terms to the left:
2d+18-(-20+4d)=0
We add all the numbers together, and all the variables
2d-(4d-20)+18=0
We get rid of parentheses
2d-4d+20+18=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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