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x in (-oo:+oo)
(1/4)*(x+20)^30 = 0
1/4*(x+20)^30 = 0
x+20 = 0 // - 20
x = -20
x in { -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20, -20 }
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