Following the formula above if you want to get degrees Celsius you have to subtract 32 from degrees Fahrenheit multiply the result by 5 and divide it by 9.
So in case with 2 we have: ((2 - 32) × 5) ÷ 9 = (-30 × 5) ÷ 9 = -150 ÷ 9 = -16.666666666667 °C