x+4*x-12=x-9*x

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



x+4x-12=x-9x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+4x-(-8x)-12=0

We add all the numbers together, and all the variables

5x-(-8x)-12=0

We get rid of parentheses

5x+8x-12=0

We add all the numbers together, and all the variables

13x-12=0

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

13x=12

x=12/13

x=12/13

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