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D( y )
y < 0
y < 0
y in <0:+oo)
5*y^(1/2)-1 = 15 // - 15
5*y^(1/2)-15-1 = 0
5*y^(1/2) = 16 // : 5
y^(1/2) = 16/5
y^(1/2) = 16/5 // ^ 2
y = 256/25
y = 256/25
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