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30=d/19
We move all terms to the left:
30-(d/19)=0
We add all the numbers together, and all the variables
-(+d/19)+30=0
We get rid of parentheses
-d/19+30=0
We multiply all the terms by the denominator
-d+30*19=0
We add all the numbers together, and all the variables
-1d+570=0
We move all terms containing d to the left, all other terms to the right
-d=-570
d=-570/-1
d=+570
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