x-3x=4

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Solution for x-3x=4 equation: 


Simplifying
x + -3x = 4

Combine like terms: x + -3x = -2x
-2x = 4

Solving
-2x = 4

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '-2'.
x = -2

Simplifying
x = -2

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