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