9+a=30

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Solution for 9+a=30 equation: 


Simplifying
9 + a = 30

Solving
9 + a = 30

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + a = 30 + -9

Combine like terms: 9 + -9 = 0
0 + a = 30 + -9
a = 30 + -9

Combine like terms: 30 + -9 = 21
a = 21

Simplifying
a = 21

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