12=4+(n-4)*1.2

Solution for 12=4+(n-4)*1.2 equation:

Simplifying
12 = 4 + (n + -4) * 1.2

Reorder the terms:
12 = 4 + (-4 + n) * 1.2

Reorder the terms for easier multiplication:
12 = 4 + 1.2(-4 + n)
12 = 4 + (-4 * 1.2 + n * 1.2)
12 = 4 + (-4.8 + 1.2n)

Combine like terms: 4 + -4.8 = -0.8
12 = -0.8 + 1.2n

Solving
12 = -0.8 + 1.2n

Solving for variable 'n'.

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

Add '-1.2n' to each side of the equation.
12 + -1.2n = -0.8 + 1.2n + -1.2n

Combine like terms: 1.2n + -1.2n = 0.0
12 + -1.2n = -0.8 + 0.0
12 + -1.2n = -0.8

Add '-12' to each side of the equation.
12 + -12 + -1.2n = -0.8 + -12

Combine like terms: 12 + -12 = 0
0 + -1.2n = -0.8 + -12
-1.2n = -0.8 + -12

Combine like terms: -0.8 + -12 = -12.8
-1.2n = -12.8

Divide each side by '-1.2'.
n = 10.66666667

Simplifying
n = 10.66666667