21=2(x-1)-x

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Solution for 21=2(x-1)-x equation:


Simplifying
21 = 2(x + -1) + -1x

Reorder the terms:
21 = 2(-1 + x) + -1x
21 = (-1 * 2 + x * 2) + -1x
21 = (-2 + 2x) + -1x

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

Solving
21 = -2 + 1x

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 + -1x = -2 + 1x + -1x

Combine like terms: 1x + -1x = 0
21 + -1x = -2 + 0
21 + -1x = -2

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

Combine like terms: 21 + -21 = 0
0 + -1x = -2 + -21
-1x = -2 + -21

Combine like terms: -2 + -21 = -23
-1x = -23

Divide each side by '-1'.
x = 23

Simplifying
x = 23

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