4=x-3x

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Solution for 4=x-3x equation: 



4=x-3x

We move all terms to the left:

4-(x-3x)=0

We add all the numbers together, and all the variables

-(-2x)+4=0

We get rid of parentheses

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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