15-3f+9f-9=

Solution for 15-3f+9f-9= equation:

Simplifying
15 + -3f + 9f + -9 = 0

Reorder the terms:
15 + -9 + -3f + 9f = 0

Combine like terms: 15 + -9 = 6
6 + -3f + 9f = 0

Combine like terms: -3f + 9f = 6f
6 + 6f = 0

Solving
6 + 6f = 0

Solving for variable 'f'.

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

Add '-6' to each side of the equation.
6 + -6 + 6f = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 6f = 0 + -6
6f = 0 + -6

Combine like terms: 0 + -6 = -6
6f = -6

Divide each side by '6'.
f = -1

Simplifying
f = -1