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2.50=d/80
We move all terms to the left:
2.50-(d/80)=0
We add all the numbers together, and all the variables
-(+d/80)+2.50=0
We add all the numbers together, and all the variables
-(+d/80)+2.5=0
We get rid of parentheses
-d/80+2.5=0
We multiply all the terms by the denominator
-d+(2.5)*80=0
We add all the numbers together, and all the variables
-1d+200=0
We move all terms containing d to the left, all other terms to the right
-d=-200
d=-200/-1
d=+200
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