3x+9x=90

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Solution for 3x+9x=90 equation: 


Simplifying
3x + 9x = 90

Combine like terms: 3x + 9x = 12x
12x = 90

Solving
12x = 90

Solving for variable 'x'.

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

Divide each side by '12'.
x = 7.5

Simplifying
x = 7.5

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