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43c+(c+61)+(c+74)=180
We move all terms to the left:
43c+(c+61)+(c+74)-(180)=0
We get rid of parentheses
43c+c+c+61+74-180=0
We add all the numbers together, and all the variables
45c-45=0
We move all terms containing c to the left, all other terms to the right
45c=45
c=45/45
c=1
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