-6=a+9+4

Solution for -6=a+9+4 equation:

Simplifying
-6 = a + 9 + 4

Reorder the terms:
-6 = 9 + 4 + a

Combine like terms: 9 + 4 = 13
-6 = 13 + a

Solving
-6 = 13 + 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 = 13 + a + -1a

Combine like terms: a + -1a = 0
-6 + -1a = 13 + 0
-6 + -1a = 13

Add '6' to each side of the equation.
-6 + 6 + -1a = 13 + 6

Combine like terms: -6 + 6 = 0
0 + -1a = 13 + 6
-1a = 13 + 6

Combine like terms: 13 + 6 = 19
-1a = 19

Divide each side by '-1'.
a = -19

Simplifying
a = -19