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12=d/20
We move all terms to the left:
12-(d/20)=0
We add all the numbers together, and all the variables
-(+d/20)+12=0
We get rid of parentheses
-d/20+12=0
We multiply all the terms by the denominator
-d+12*20=0
We add all the numbers together, and all the variables
-1d+240=0
We move all terms containing d to the left, all other terms to the right
-d=-240
d=-240/-1
d=+240
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