4x+12=9x-9

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Solution for 4x+12=9x-9 equation: 



4x+12=9x-9

We move all terms to the left:

4x+12-(9x-9)=0

We get rid of parentheses

4x-9x+9+12=0

We add all the numbers together, and all the variables

-5x+21=0

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

-5x=-21

x=-21/-5

x=4+1/5

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