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(c-13)+(c+10)+31=180
We move all terms to the left:
(c-13)+(c+10)+31-(180)=0
We add all the numbers together, and all the variables
(c-13)+(c+10)-149=0
We get rid of parentheses
c+c-13+10-149=0
We add all the numbers together, and all the variables
2c-152=0
We move all terms containing c to the left, all other terms to the right
2c=152
c=152/2
c=76
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