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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 24/7 // - 24/7
4/y-(24/7) = 0
4/y-24/7 = 0
4*y^-1 = 24/7 // : 4
y^-1 = 6/7
-1 < 0
1/(y^1) = 6/7 // * y^1
1 = 6/7*y^1 // : 6/7
7/6 = y^1
y = 7/6
y = 7/6
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