3=-3(f-15)

Solution for 3=-3(f-15) equation:

Simplifying
3 = -3(f + -15)

Reorder the terms:
3 = -3(-15 + f)
3 = (-15 * -3 + f * -3)
3 = (45 + -3f)

Solving
3 = 45 + -3f

Solving for variable 'f'.

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

Add '3f' to each side of the equation.
3 + 3f = 45 + -3f + 3f

Combine like terms: -3f + 3f = 0
3 + 3f = 45 + 0
3 + 3f = 45

Add '-3' to each side of the equation.
3 + -3 + 3f = 45 + -3

Combine like terms: 3 + -3 = 0
0 + 3f = 45 + -3
3f = 45 + -3

Combine like terms: 45 + -3 = 42
3f = 42

Divide each side by '3'.
f = 14

Simplifying
f = 14