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21=d/19
We move all terms to the left:
21-(d/19)=0
We add all the numbers together, and all the variables
-(+d/19)+21=0
We get rid of parentheses
-d/19+21=0
We multiply all the terms by the denominator
-d+21*19=0
We add all the numbers together, and all the variables
-1d+399=0
We move all terms containing d to the left, all other terms to the right
-d=-399
d=-399/-1
d=+399
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