31-a-12=5

Solution for 31-a-12=5 equation:

Simplifying
31 + -1a + -12 = 5

Reorder the terms:
31 + -12 + -1a = 5

Combine like terms: 31 + -12 = 19
19 + -1a = 5

Solving
19 + -1a = 5

Solving for variable 'a'.

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

Add '-19' to each side of the equation.
19 + -19 + -1a = 5 + -19

Combine like terms: 19 + -19 = 0
0 + -1a = 5 + -19
-1a = 5 + -19

Combine like terms: 5 + -19 = -14
-1a = -14

Divide each side by '-1'.
a = 14

Simplifying
a = 14