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80=d/4
We move all terms to the left:
80-(d/4)=0
We add all the numbers together, and all the variables
-(+d/4)+80=0
We get rid of parentheses
-d/4+80=0
We multiply all the terms by the denominator
-d+80*4=0
We add all the numbers together, and all the variables
-1d+320=0
We move all terms containing d to the left, all other terms to the right
-d=-320
d=-320/-1
d=+320
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