120-5x=4x+21

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Solution for 120-5x=4x+21 equation:


Simplifying
120 + -5x = 4x + 21

Reorder the terms:
120 + -5x = 21 + 4x

Solving
120 + -5x = 21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
120 + -5x + -4x = 21 + 4x + -4x

Combine like terms: -5x + -4x = -9x
120 + -9x = 21 + 4x + -4x

Combine like terms: 4x + -4x = 0
120 + -9x = 21 + 0
120 + -9x = 21

Add '-120' to each side of the equation.
120 + -120 + -9x = 21 + -120

Combine like terms: 120 + -120 = 0
0 + -9x = 21 + -120
-9x = 21 + -120

Combine like terms: 21 + -120 = -99
-9x = -99

Divide each side by '-9'.
x = 11

Simplifying
x = 11

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