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x in (-oo:+oo)
x*((x^2)/(-2))+2 = 7.7 // - 7.7
x*((x^2)/(-2))-7.7+2 = 0
-1/2*x^3 = 5.7 // : -1/2
x^3 = -11.4
x^3 = -11.4 // ^ 1/3
x = -11.4^(1/3)
x = -11.4^(1/3)
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