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x in (-oo:+oo)
(x/2)*x^7 = 49 // - 49
(x/2)*x^7-49 = 0
1/2*x^8 = 49 // : 1/2
x^8 = 98
x^8 = 98 // ^ 1/8
abs(x) = 98^(1/8)
x = 98^(1/8) or x = -98^(1/8)
x in { 98^(1/8), -98^(1/8) }
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