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a in (-oo:+oo)
4*a^3-(12*a^2)-(((4*a)/4)*a) = 0
4*a^3-12*a^2-a^2 = 0
4*a^3-13*a^2 = 0
a^2*(4*a-13) = 0
4*a-13 = 0 // + 13
4*a = 13 // : 4
a = 13/4
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in { 13/4, 0 }
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