3+-1x+f=0

Solution for 3+-1x+f=0 equation:

Simplifying
3 + -1x + f = 0

Reorder the terms:
3 + f + -1x = 0

Solving
3 + f + -1x = 0

Solving for variable 'f'.

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

Add '-3' to each side of the equation.
3 + f + -3 + -1x = 0 + -3

Reorder the terms:
3 + -3 + f + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + f + -1x = 0 + -3
f + -1x = 0 + -3

Combine like terms: 0 + -3 = -3
f + -1x = -3

Add 'x' to each side of the equation.
f + -1x + x = -3 + x

Combine like terms: -1x + x = 0
f + 0 = -3 + x
f = -3 + x

Simplifying
f = -3 + x