-9+3=a

Solution for -9+3=a equation:

Simplifying
-9 + 3 = a

Combine like terms: -9 + 3 = -6
-6 = a

Solving
-6 = 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.
-6 + -1a = a + -1a

Combine like terms: a + -1a = 0
-6 + -1a = 0

Add '6' to each side of the equation.
-6 + 6 + -1a = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1a = 0 + 6
-1a = 0 + 6

Combine like terms: 0 + 6 = 6
-1a = 6

Divide each side by '-1'.
a = -6

Simplifying
a = -6