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x in (-oo:+oo)
F = (9/5)*x^39+32 // - (9/5)*x^39+32
F-((9/5)*x^39)-32 = 0
F+(-9/5)*x^39-32 = 0
-9/5*x^39 = -(F-32) // : -9/5
x^39 = -5/9*(32-F)
x^39 = -5/9*(32-F) // ^ 1/39
x = -(5/9)^(1/39)*(32-F)^(1/39)
x = -(5/9)^(1/39)*(32-F)^(1/39)
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