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D( x )
x^(7/5) <= 0
x^(7/5) <= 0
x^(7/5) <= 0
1*x^(7/5) <= 0
1*x^(7/5) <= 0 // : 1
x^(7/5) <= 0/1
x^(7/5) <= 0
x >= 0
x in <0:0>
x in (-oo:0) U (0:+oo)
ln(x^(7/5)) = 0
ln(x^(7/5)) = ln(e^0)
x^(7/5) = e^0
x^(7/5)-e^0 = 0
1*x^(7/5) = 1 // : 1
x^(7/5) = 1
x^(7/5) = 1 // ^ 5
x^7 = 1 // ^ 1/7
x = 1
x = 1
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