3c+9=-3c-9

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Solution for 3c+9=-3c-9 equation: 



3c+9=-3c-9

We move all terms to the left:

3c+9-(-3c-9)=0

We get rid of parentheses

3c+3c+9+9=0

We add all the numbers together, and all the variables

6c+18=0

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

6c=-18

c=-18/6

c=-3

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