9x+12x=240

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Solution for 9x+12x=240 equation: 


Simplifying
9x + 12x = 240

Combine like terms: 9x + 12x = 21x
21x = 240

Solving
21x = 240

Solving for variable 'x'.

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

Divide each side by '21'.
x = 11.42857143

Simplifying
x = 11.42857143

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