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2c+(2c-20)+(3c-17)=180
We move all terms to the left:
2c+(2c-20)+(3c-17)-(180)=0
We get rid of parentheses
2c+2c+3c-20-17-180=0
We add all the numbers together, and all the variables
7c-217=0
We move all terms containing c to the left, all other terms to the right
7c=217
c=217/7
c=31
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