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625=2.50c-500
We move all terms to the left:
625-(2.50c-500)=0
We get rid of parentheses
-2.50c+500+625=0
We add all the numbers together, and all the variables
-2.5c+1125=0
We move all terms containing c to the left, all other terms to the right
-2.5c=-1125
c=-1125/-2.5
c=+450
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