-x+3x=8+4

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Solution for -x+3x=8+4 equation: 



-x+3x=8+4

We move all terms to the left:

-x+3x-(8+4)=0

We add all the numbers together, and all the variables

-x+3x-12=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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