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(-1/3)*x^7 = 19 // - 19
(-1/3)*x^7-19 = 0
-1/3*x^7 = 19 // : -1/3
x^7 = -57
x^7 = -57 // ^ 1/7
x = -57^(1/7)
x = -57^(1/7)
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