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9c-99=7c-59
We move all terms to the left:
9c-99-(7c-59)=0
We get rid of parentheses
9c-7c+59-99=0
We add all the numbers together, and all the variables
2c-40=0
We move all terms containing c to the left, all other terms to the right
2c=40
c=40/2
c=20
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