12=10+a

Solution for 12=10+a equation:

Simplifying
12 = 10 + a

Solving
12 = 10 + 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.
12 + -1a = 10 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = 10 + 0
12 + -1a = 10

Add '-12' to each side of the equation.
12 + -12 + -1a = 10 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 10 + -12
-1a = 10 + -12

Combine like terms: 10 + -12 = -2
-1a = -2

Divide each side by '-1'.
a = 2

Simplifying
a = 2