4x+9x=99

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Solution for 4x+9x=99 equation: 


Simplifying
4x + 9x = 99

Combine like terms: 4x + 9x = 13x
13x = 99

Solving
13x = 99

Solving for variable 'x'.

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

Divide each side by '13'.
x = 7.615384615

Simplifying
x = 7.615384615

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