A+21=X

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Solution for A+21=X equation: 


Simplifying
A + 21 = X

Reorder the terms:
21 + A = X

Solving
21 + A = X

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 = -21 + X

Combine like terms: 21 + -21 = 0
0 + A = -21 + X
A = -21 + X

Simplifying
A = -21 + X

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