120-9=n

Solution for 120-9=n equation:

Simplifying
120 + -9 = n

Combine like terms: 120 + -9 = 111
111 = n

Solving
111 = n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
111 + -1n = n + -1n

Combine like terms: n + -1n = 0
111 + -1n = 0

Add '-111' to each side of the equation.
111 + -111 + -1n = 0 + -111

Combine like terms: 111 + -111 = 0
0 + -1n = 0 + -111
-1n = 0 + -111

Combine like terms: 0 + -111 = -111
-1n = -111

Divide each side by '-1'.
n = 111

Simplifying
n = 111