2x-4x=9

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Solution for 2x-4x=9 equation: 


Simplifying
2x + -4x = 9

Combine like terms: 2x + -4x = -2x
-2x = 9

Solving
-2x = 9

Solving for variable 'x'.

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

Divide each side by '-2'.
x = -4.5

Simplifying
x = -4.5

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