4x-x-3x=9

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Solution for 4x-x-3x=9 equation: 


Simplifying
4x + -1x + -3x = 9

Combine like terms: 4x + -1x = 3x
3x + -3x = 9

Combine like terms: 3x + -3x = 0
0 = 9

Solving
0 = 9

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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