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x in (-oo:+oo)
2*x*x^2 = -48/3 // + -48/3
2*x*x^2-(-48/3) = 0
2*x*x^2+16 = 0
2*x^3 = -16 // : 2
x^3 = -8
x^3 = -8 // ^ 1/3
x = -2
x = -2
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