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7c-100=2c+200
We move all terms to the left:
7c-100-(2c+200)=0
We get rid of parentheses
7c-2c-200-100=0
We add all the numbers together, and all the variables
5c-300=0
We move all terms containing c to the left, all other terms to the right
5c=300
c=300/5
c=60
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