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5c+2(2c-4)=55
We move all terms to the left:
5c+2(2c-4)-(55)=0
We multiply parentheses
5c+4c-8-55=0
We add all the numbers together, and all the variables
9c-63=0
We move all terms containing c to the left, all other terms to the right
9c=63
c=63/9
c=7
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