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