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x in (-oo:+oo)
x^3 = 42/6 // - 42/6
x^3-(42/6) = 0
x^3-7 = 0
1*x^3 = 7 // : 1
x^3 = 7
x^3 = 7 // ^ 1/3
x = 7^(1/3)
x = 7^(1/3)
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