81-2x=2x+21

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Solution for 81-2x=2x+21 equation:


Simplifying
81 + -2x = 2x + 21

Reorder the terms:
81 + -2x = 21 + 2x

Solving
81 + -2x = 21 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
81 + -2x + -2x = 21 + 2x + -2x

Combine like terms: -2x + -2x = -4x
81 + -4x = 21 + 2x + -2x

Combine like terms: 2x + -2x = 0
81 + -4x = 21 + 0
81 + -4x = 21

Add '-81' to each side of the equation.
81 + -81 + -4x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -4x = 21 + -81
-4x = 21 + -81

Combine like terms: 21 + -81 = -60
-4x = -60

Divide each side by '-4'.
x = 15

Simplifying
x = 15

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