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7c=-8c+75
We move all terms to the left:
7c-(-8c+75)=0
We get rid of parentheses
7c+8c-75=0
We add all the numbers together, and all the variables
15c-75=0
We move all terms containing c to the left, all other terms to the right
15c=75
c=75/15
c=5
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