-3x+9x=30

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Solution for -3x+9x=30 equation: 


Simplifying
-3x + 9x = 30

Combine like terms: -3x + 9x = 6x
6x = 30

Solving
6x = 30

Solving for variable 'x'.

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

Divide each side by '6'.
x = 5

Simplifying
x = 5

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