81-7x=20x+21

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Solution for 81-7x=20x+21 equation:


Simplifying
81 + -7x = 20x + 21

Reorder the terms:
81 + -7x = 21 + 20x

Solving
81 + -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.
81 + -7x + -20x = 21 + 20x + -20x

Combine like terms: -7x + -20x = -27x
81 + -27x = 21 + 20x + -20x

Combine like terms: 20x + -20x = 0
81 + -27x = 21 + 0
81 + -27x = 21

Add '-81' to each side of the equation.
81 + -81 + -27x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -27x = 21 + -81
-27x = 21 + -81

Combine like terms: 21 + -81 = -60
-27x = -60

Divide each side by '-27'.
x = 2.222222222

Simplifying
x = 2.222222222

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