15+12=a

Solution for 15+12=a equation:

Simplifying
15 + 12 = a

Combine like terms: 15 + 12 = 27
27 = a

Solving
27 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
27 + -1a = a + -1a

Combine like terms: a + -1a = 0
27 + -1a = 0

Add '-27' to each side of the equation.
27 + -27 + -1a = 0 + -27

Combine like terms: 27 + -27 = 0
0 + -1a = 0 + -27
-1a = 0 + -27

Combine like terms: 0 + -27 = -27
-1a = -27

Divide each side by '-1'.
a = 27

Simplifying
a = 27