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