2(-0.5)+21=20

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Solution for 2(-0.5)+21=20 equation: 


Simplifying
2(-0.5) + 21 = 20

Multiply 2 * -0.5
-1 + 21 = 20

Combine like terms: -1 + 21 = 20
20 = 20

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

Combine like terms: 20 + -20 = 0
0 = 20 + -20

Combine like terms: 20 + -20 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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