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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15/25 = 75/y // - 75/y
15/25-(75/y) = 0
15/25-75*y^-1 = 0
-75*y^-1 = -3/5 // : -75
y^-1 = 1/125
-1 < 0
1/(y^1) = 1/125 // * y^1
1 = 1/125*y^1 // : 1/125
125 = y^1
y = 125
y = 125
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