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x in (-oo:+oo)
x*(((-4*x)^2)/8)-5 = -3 // + 3
x*(((-4*x)^2)/8)-5+3 = 0
2*x^3 = 2 // : 2
x^3 = 1
x^3 = 1 // ^ 1/3
x = 1
x = 1
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