6c-9=7+8c

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Solution for 6c-9=7+8c equation: 



6c-9=7+8c

We move all terms to the left:

6c-9-(7+8c)=0

We add all the numbers together, and all the variables

6c-(8c+7)-9=0

We get rid of parentheses

6c-8c-7-9=0

We add all the numbers together, and all the variables

-2c-16=0

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

-2c=16

c=16/-2

c=-8

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