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x in (-oo:+oo)
2*x-((7/4)*x*x^39) = 0
(-7/4)*x^40+2*x = 0
2*x-7/4*x^40 = 0
x*(2-7/4*x^39) = 0
-7/4*x^39 = -2 // : -7/4
x^39 = 8/7
x^39 = 8/7 // ^ 1/39
x = (8/7)^(1/39)
x = 0
x = 0
x in { (8/7)^(1/39), 0 }
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