21+a=15

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Solution for 21+a=15 equation: 


Simplifying
21 + a = 15

Solving
21 + a = 15

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 = 15 + -21

Combine like terms: 21 + -21 = 0
0 + a = 15 + -21
a = 15 + -21

Combine like terms: 15 + -21 = -6
a = -6

Simplifying
a = -6

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