3x+6x+x=90

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Solution for 3x+6x+x=90 equation: 


Simplifying
3x + 6x + x = 90

Combine like terms: 3x + 6x = 9x
9x + x = 90

Combine like terms: 9x + x = 10x
10x = 90

Solving
10x = 90

Solving for variable 'x'.

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

Divide each side by '10'.
x = 9

Simplifying
x = 9

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