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x in (-oo:+oo)
(x-(3/10))^10 = 0
(x-3/10)^10 = 0
x-3/10 = 0 // + 3/10
x = 3/10
x in { 3/10, 3/10, 3/10, 3/10, 3/10, 3/10, 3/10, 3/10, 3/10, 3/10 }
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