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30=d/2
We move all terms to the left:
30-(d/2)=0
We add all the numbers together, and all the variables
-(+d/2)+30=0
We get rid of parentheses
-d/2+30=0
We multiply all the terms by the denominator
-d+30*2=0
We add all the numbers together, and all the variables
-1d+60=0
We move all terms containing d to the left, all other terms to the right
-d=-60
d=-60/-1
d=+60
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