-x+3x=4

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Solution for -x+3x=4 equation: 



-x+3x=4

We move all terms to the left:

-x+3x-(4)=0

We add all the numbers together, and all the variables

2x-4=0

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

2x=4

x=4/2

x=2

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