-4x-5x=72

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Solution for -4x-5x=72 equation: 


Simplifying
-4x + -5x = 72

Combine like terms: -4x + -5x = -9x
-9x = 72

Solving
-9x = 72

Solving for variable 'x'.

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

Divide each side by '-9'.
x = -8

Simplifying
x = -8

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