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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-(6/y)-2*4 = 15 // - 15
-(6/y)-2*4-15 = 0
-6*y^-1-2*4-15 = 0
-6*y^-1 = 23 // : -6
y^-1 = -23/6
-1 < 0
1/(y^1) = -23/6 // * y^1
1 = -23/6*y^1 // : -23/6
-6/23 = y^1
y = -6/23
y = -6/23
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