3(f-5)+9-f=4

Solution for 3(f-5)+9-f=4 equation:

Simplifying
3(f + -5) + 9 + -1f = 4

Reorder the terms:
3(-5 + f) + 9 + -1f = 4
(-5 * 3 + f * 3) + 9 + -1f = 4
(-15 + 3f) + 9 + -1f = 4

Reorder the terms:
-15 + 9 + 3f + -1f = 4

Combine like terms: -15 + 9 = -6
-6 + 3f + -1f = 4

Combine like terms: 3f + -1f = 2f
-6 + 2f = 4

Solving
-6 + 2f = 4

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 + 2f = 4 + 6

Combine like terms: -6 + 6 = 0
0 + 2f = 4 + 6
2f = 4 + 6

Combine like terms: 4 + 6 = 10
2f = 10

Divide each side by '2'.
f = 5

Simplifying
f = 5