120-7x=20x-21

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Solution for 120-7x=20x-21 equation:


Simplifying
120 + -7x = 20x + -21

Reorder the terms:
120 + -7x = -21 + 20x

Solving
120 + -7x = -21 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
120 + -7x + -20x = -21 + 20x + -20x

Combine like terms: -7x + -20x = -27x
120 + -27x = -21 + 20x + -20x

Combine like terms: 20x + -20x = 0
120 + -27x = -21 + 0
120 + -27x = -21

Add '-120' to each side of the equation.
120 + -120 + -27x = -21 + -120

Combine like terms: 120 + -120 = 0
0 + -27x = -21 + -120
-27x = -21 + -120

Combine like terms: -21 + -120 = -141
-27x = -141

Divide each side by '-27'.
x = 5.222222222

Simplifying
x = 5.222222222

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