21=0.5x-x

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Solution for 21=0.5x-x equation:


Simplifying
21 = 0.5x + -1x

Combine like terms: 0.5x + -1x = -0.5x
21 = -0.5x

Solving
21 = -0.5x

Solving for variable 'x'.

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

Add '0.5x' to each side of the equation.
21 + 0.5x = -0.5x + 0.5x

Combine like terms: -0.5x + 0.5x = 0.0
21 + 0.5x = 0.0

Add '-21' to each side of the equation.
21 + -21 + 0.5x = 0.0 + -21

Combine like terms: 21 + -21 = 0
0 + 0.5x = 0.0 + -21
0.5x = 0.0 + -21

Combine like terms: 0.0 + -21 = -21
0.5x = -21

Divide each side by '0.5'.
x = -42

Simplifying
x = -42

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