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a in (-oo:+oo)
a/2-((a^4)/16) = 0
1/2*a-1/16*a^4 = 0
1/2*a*(1-1/8*a^3) = 0
-1/8*a^3 = -1 // : -1/8
a^3 = 8
a^3 = 8 // ^ 1/3
a = 2
a/2 = 0
1/2*a = 0 // : 1/2
a = 0
a in { 2, 0 }
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