9=3(f+1)

Solution for 9=3(f+1) equation:

Simplifying
9 = 3(f + 1)

Reorder the terms:
9 = 3(1 + f)
9 = (1 * 3 + f * 3)
9 = (3 + 3f)

Solving
9 = 3 + 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.
9 + -3f = 3 + 3f + -3f

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

Add '-9' to each side of the equation.
9 + -9 + -3f = 3 + -9

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

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

Divide each side by '-3'.
f = 2

Simplifying
f = 2