-640+x*-4+x*9=0

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Solution for -640+x*-4+x*9=0 equation:


Simplifying
-640 + x * -4 + x * 9 = 0

Reorder the terms for easier multiplication:
-640 + -4x + x * 9 = 0

Reorder the terms for easier multiplication:
-640 + -4x + 9x = 0

Combine like terms: -4x + 9x = 5x
-640 + 5x = 0

Solving
-640 + 5x = 0

Solving for variable 'x'.

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

Add '640' to each side of the equation.
-640 + 640 + 5x = 0 + 640

Combine like terms: -640 + 640 = 0
0 + 5x = 0 + 640
5x = 0 + 640

Combine like terms: 0 + 640 = 640
5x = 640

Divide each side by '5'.
x = 128

Simplifying
x = 128

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