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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 15/60 // - 15/60
5/y-(15/60) = 0
5/y-1/4 = 0
5*y^-1 = 1/4 // : 5
y^-1 = 1/20
-1 < 0
1/(y^1) = 1/20 // * y^1
1 = 1/20*y^1 // : 1/20
20 = y^1
y = 20
y = 20
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