21-2x=18+x

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Solution for 21-2x=18+x equation:


Simplifying
21 + -2x = 18 + x

Solving
21 + -2x = 18 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
21 + -2x + -1x = 18 + x + -1x

Combine like terms: -2x + -1x = -3x
21 + -3x = 18 + x + -1x

Combine like terms: x + -1x = 0
21 + -3x = 18 + 0
21 + -3x = 18

Add '-21' to each side of the equation.
21 + -21 + -3x = 18 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 18 + -21
-3x = 18 + -21

Combine like terms: 18 + -21 = -3
-3x = -3

Divide each side by '-3'.
x = 1

Simplifying
x = 1

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