(7c-7)+(6c-8)=90

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Solution for (7c-7)+(6c-8)=90 equation: 



(7c-7)+(6c-8)=90

We move all terms to the left:

(7c-7)+(6c-8)-(90)=0

We get rid of parentheses

7c+6c-7-8-90=0

We add all the numbers together, and all the variables

13c-105=0

We move all terms containing c to the left, all other terms to the right

13c=105

c=105/13

c=8+1/13

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