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520=15c+400
We move all terms to the left:
520-(15c+400)=0
We get rid of parentheses
-15c-400+520=0
We add all the numbers together, and all the variables
-15c+120=0
We move all terms containing c to the left, all other terms to the right
-15c=-120
c=-120/-15
c=+8
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