9[a+4]=111.6

Solution for 9[a+4]=111.6 equation:

Simplifying
9[a + 4] = 111.6

Reorder the terms:
9[4 + a] = 111.6
[4 * 9 + a * 9] = 111.6
[36 + 9a] = 111.6

Solving
36 + 9a = 111.6

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-36' to each side of the equation.
36 + -36 + 9a = 111.6 + -36

Combine like terms: 36 + -36 = 0
0 + 9a = 111.6 + -36
9a = 111.6 + -36

Combine like terms: 111.6 + -36 = 75.6
9a = 75.6

Divide each side by '9'.
a = 8.4

Simplifying
a = 8.4