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D( y )
y < 0
y < 0
y in <0:+oo)
y^(7/6)-128 = 0
1*y^(7/6) = 128 // : 1
y^(7/6) = 128
y^(7/6) = 128 // ^ 6
y^7 = 4398046511104 // ^ 1/7
y = 64
y = 64
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