Celsius to Fahrenheit

BOILING WATER
℉ 212
℃ 100

Celsius to Fahrenheit

[℃ × 9/5] +32 = ℉

1. 100 x 9/5 + 32 = ℉

2. 20 x 9 + 32 = ℉

3. 180 + 32 = ℉

4. 212 ℉

Let say I know Fahrenheit. However I am given the Celsius Formula. How do I answer ℃

[℃ × 9/5] +32 = ℉

1. [℃ × 9/5] +32=212

2. ℃ x 9/5+ 32-32=212-32

3. ℃ x 9/5 ÷5/9 = 180 ×5/9

4. 20 x 5= ℃

5. 100 ℃