-9+4x=7x+12

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Solution for -9+4x=7x+12 equation: 



-9+4x=7x+12

We move all terms to the left:

-9+4x-(7x+12)=0

We get rid of parentheses

4x-7x-12-9=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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