4+5=a

Solution for 4+5=a equation:

Simplifying
4 + 5 = a

Combine like terms: 4 + 5 = 9
9 = a

Solving
9 = 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.
9 + -1a = a + -1a

Combine like terms: a + -1a = 0
9 + -1a = 0

Add '-9' to each side of the equation.
9 + -9 + -1a = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1a = 0 + -9
-1a = 0 + -9

Combine like terms: 0 + -9 = -9
-1a = -9

Divide each side by '-1'.
a = 9

Simplifying
a = 9