Pada suhu berapa dapat terjadi angka berikut? angka skala C = angka skala F

XC = xF
xC = ((9x/5) + 32) F
9x/5 + 32 = x
9x/5 = x – 32
9x = 5x – 160
9x-5x = -160
4x = – 160
x = – 40

(212 – x) / (100 – x) = (212 – 32) / (100 – 0)
(212 – x) / (100 – x) = 1,8
212 – x = 1,8(100 – x)
212 – x = 180 – 1,8x
212 – 180 = -1,8x + x
-0,8x = 32
x = -40°