A-4+9=21

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Solution for A-4+9=21 equation: 


Simplifying
A + -4 + 9 = 21

Reorder the terms:
-4 + 9 + A = 21

Combine like terms: -4 + 9 = 5
5 + A = 21

Solving
5 + A = 21

Solving for variable 'A'.

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

Add '-5' to each side of the equation.
5 + -5 + A = 21 + -5

Combine like terms: 5 + -5 = 0
0 + A = 21 + -5
A = 21 + -5

Combine like terms: 21 + -5 = 16
A = 16

Simplifying
A = 16

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