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3*x^7+((5-3)^2)/7-3+5 = 0
3*x^7 = -18/7 // : 3
x^7 = -6/7
x^7 = -6/7 // ^ 1/7
x = -(6/7)^(1/7)
x = -(6/7)^(1/7)
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