(9+a)=12

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Solution for (9+a)=12 equation: 


Simplifying
(9 + a) = 12

Remove parenthesis around (9 + a)
9 + a = 12

Solving
9 + a = 12

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 = 12 + -9

Combine like terms: 9 + -9 = 0
0 + a = 12 + -9
a = 12 + -9

Combine like terms: 12 + -9 = 3
a = 3

Simplifying
a = 3

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