33=a-12

Solution for 33=a-12 equation:

Simplifying
33 = a + -12

Reorder the terms:
33 = -12 + a

Solving
33 = -12 + 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.
33 + -1a = -12 + a + -1a

Combine like terms: a + -1a = 0
33 + -1a = -12 + 0
33 + -1a = -12

Add '-33' to each side of the equation.
33 + -33 + -1a = -12 + -33

Combine like terms: 33 + -33 = 0
0 + -1a = -12 + -33
-1a = -12 + -33

Combine like terms: -12 + -33 = -45
-1a = -45

Divide each side by '-1'.
a = 45

Simplifying
a = 45