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(4c+2)+(2c-7)=90
We move all terms to the left:
(4c+2)+(2c-7)-(90)=0
We get rid of parentheses
4c+2c+2-7-90=0
We add all the numbers together, and all the variables
6c-95=0
We move all terms containing c to the left, all other terms to the right
6c=95
c=95/6
c=15+5/6
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