x-21=-x*2

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Solution for x-21=-x*2 equation:


Simplifying
x + -21 = -1x * 2

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

Reorder the terms for easier multiplication:
-21 + x = -1 * 2x

Multiply -1 * 2
-21 + x = -2x

Solving
-21 + x = -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.
-21 + x + 2x = -2x + 2x

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

Combine like terms: -2x + 2x = 0
-21 + 3x = 0

Add '21' to each side of the equation.
-21 + 21 + 3x = 0 + 21

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

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

Divide each side by '3'.
x = 7

Simplifying
x = 7

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