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D( x )
x < 0
x < 0
x in <0:+oo)
x^(7/12) = 7 // - 7
x^(7/12)-7 = 0
1*x^(7/12) = 7 // : 1
x^(7/12) = 7
x^(7/12) = 7 // ^ 12
x^7 = 13841287201 // ^ 1/7
x = 7*16807^(1/7)
x = 7*16807^(1/7)
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