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