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misalkan :
Celcius = 5x
Fahrenheit = 9x + 32
maka :
5x = 9x + 32
5x - 9x = 32
-4x = 32
-x = 32/4
-x = 8
x = -8
jadi :
Celcius = Fahrenheit
5x = 9x + 32
5 x (-8) = 9 x (-8) + 32
-40 = -72 + 32
-40 = -40
-40 derajat Celcius = -40 derajat Fahrenheit.