Question 1062769
9/5X+ 32 = (X-32) 5/9
Solve for X.  It is the temperature that cellius [sic] and Fahrenheit Are equal.
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9x/5 + 32 = (X-32)*5/9
Multiply by 45
81x + 1440 = 25*(x-32) = 25x - 800
56x = -2240
x = -40
-40 C = -40 F
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C = Celsius, not cellius
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Do it like this:
F = 9C/5 + 32
@ F = C:
F = 9F/5 + 32
5F = 9F + 160
-4F = 160
F = -40 = C
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At -40, mercury freezes.  -38.83 C, actually.