7=c+9

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Solution for 7=c+9 equation: 



7=c+9

We move all terms to the left:

7-(c+9)=0

We get rid of parentheses

-c-9+7=0

We add all the numbers together, and all the variables

-1c-2=0

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

-c=2

c=2/-1

c=-2

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