15=7c+c+9-5c

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Solution for 15=7c+c+9-5c equation: 



15=7c+c+9-5c

We move all terms to the left:

15-(7c+c+9-5c)=0

We add all the numbers together, and all the variables

-(3c+9)+15=0

We get rid of parentheses

-3c-9+15=0

We add all the numbers together, and all the variables

-3c+6=0

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

-3c=-6

c=-6/-3

c=+2

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