c+9=4c-9

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Solution for c+9=4c-9 equation: 



c+9=4c-9

We move all terms to the left:

c+9-(4c-9)=0

We get rid of parentheses

c-4c+9+9=0

We add all the numbers together, and all the variables

-3c+18=0

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

-3c=-18

c=-18/-3

c=+6

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