7c-9=-1+9c

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Solution for 7c-9=-1+9c equation: 



7c-9=-1+9c

We move all terms to the left:

7c-9-(-1+9c)=0

We add all the numbers together, and all the variables

7c-(9c-1)-9=0

We get rid of parentheses

7c-9c+1-9=0

We add all the numbers together, and all the variables

-2c-8=0

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

-2c=8

c=8/-2

c=-4

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