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D( y )
y < 0
y < 0
y in <0:+oo)
y^(1/4)*(y^(11/4)+y^(7/4)) = 0
y^(11/4)+y^(7/4) = 0
y^(7/4)*(y+1) = 0
y+1 = 0 // - 1
y = -1
y^(7/4)*(y+1) = 0
y^(1/4)*y^(7/4)*(y+1) = 0
( y+1 )
y+1 = 0 // - 1
y = -1
( y^(1/4) )
1*y^(1/4) = 0 // : 1
y^(1/4) = 0
y = 0
( y^(7/4) )
1*y^(7/4) = 0 // : 1
y^(7/4) = 0
y = 0
y in { -1}
y in { 0, 0 }
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