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x in (-oo:+oo)
c = ((140-32)*x^5)/9 // - ((140-32)*x^5)/9
c-(((140-32)*x^5)/9) = 0
-12*x^5 = -c // : -12
x^5 = c/12
x^5 = c/12 // ^ 1/5
x = (c^(1/5))/(12^(1/5))
x = (c^(1/5))/(12^(1/5))
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