21=.5x-20

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Solution for 21=.5x-20 equation:


Simplifying
21 = 0.5x + -20

Reorder the terms:
21 = -20 + 0.5x

Solving
21 = -20 + 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 = -20 + 0.5x + -0.5x

Combine like terms: 0.5x + -0.5x = 0.0
21 + -0.5x = -20 + 0.0
21 + -0.5x = -20

Add '-21' to each side of the equation.
21 + -21 + -0.5x = -20 + -21

Combine like terms: 21 + -21 = 0
0 + -0.5x = -20 + -21
-0.5x = -20 + -21

Combine like terms: -20 + -21 = -41
-0.5x = -41

Divide each side by '-0.5'.
x = 82

Simplifying
x = 82

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