-9x+3x=42

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Solution for -9x+3x=42 equation: 


Simplifying
-9x + 3x = 42

Combine like terms: -9x + 3x = -6x
-6x = 42

Solving
-6x = 42

Solving for variable 'x'.

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

Divide each side by '-6'.
x = -7

Simplifying
x = -7

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