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x in (-oo:+oo)
(x^7)/4 = 128 // - 128
(x^7)/4-128 = 0
1/4*x^7 = 128 // : 1/4
x^7 = 512
x^7 = 512 // ^ 1/7
x = 2*4^(1/7)
x = 2*4^(1/7)
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