a+21=20

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Solution for a+21=20 equation: 


Simplifying
a + 21 = 20

Reorder the terms:
21 + a = 20

Solving
21 + a = 20

Solving for variable 'a'.

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

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

Combine like terms: 21 + -21 = 0
0 + a = 20 + -21
a = 20 + -21

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

Simplifying
a = -1

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