4x+5x=12

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Solution for 4x+5x=12 equation: 


Simplifying
4x + 5x = 12

Combine like terms: 4x + 5x = 9x
9x = 12

Solving
9x = 12

Solving for variable 'x'.

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

Divide each side by '9'.
x = 1.333333333

Simplifying
x = 1.333333333

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