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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
24/y = -6/7 // + -6/7
24/y-(-6/7) = 0
24/y+6/7 = 0
24*y^-1 = -6/7 // : 24
y^-1 = -1/28
-1 < 0
1/(y^1) = -1/28 // * y^1
1 = -1/28*y^1 // : -1/28
-28 = y^1
y = -28
y = -28
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