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(4*x^7)/5 = 128 // - 128
(4*x^7)/5-128 = 0
4/5*x^7 = 128 // : 4/5
x^7 = 160
x^7 = 160 // ^ 1/7
x = 160^(1/7)
x = 160^(1/7)
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