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°C = 5/9(°F - 32)
5y = 5/9 (y - 32)
45y = 5y - 160
40y = -160
y = -4°
Pembacaan termometer Celcius = 5y
= 5 x (-4°C)
= -20°C
Jadi pembacaan termometer Celcius adalah -20°C