A+17=21

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Solution for A+17=21 equation: 


Simplifying
A + 17 = 21

Reorder the terms:
17 + A = 21

Solving
17 + A = 21

Solving for variable 'A'.

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

Add '-17' to each side of the equation.
17 + -17 + A = 21 + -17

Combine like terms: 17 + -17 = 0
0 + A = 21 + -17
A = 21 + -17

Combine like terms: 21 + -17 = 4
A = 4

Simplifying
A = 4

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