42=2f-3

Solution for 42=2f-3 equation:

Simplifying
42 = 2f + -3

Reorder the terms:
42 = -3 + 2f

Solving
42 = -3 + 2f

Solving for variable 'f'.

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

Add '-2f' to each side of the equation.
42 + -2f = -3 + 2f + -2f

Combine like terms: 2f + -2f = 0
42 + -2f = -3 + 0
42 + -2f = -3

Add '-42' to each side of the equation.
42 + -42 + -2f = -3 + -42

Combine like terms: 42 + -42 = 0
0 + -2f = -3 + -42
-2f = -3 + -42

Combine like terms: -3 + -42 = -45
-2f = -45

Divide each side by '-2'.
f = 22.5

Simplifying
f = 22.5