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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y = 17.5 // - 17.5
7/y-17.5 = 0
7*y^-1 = 17.5 // : 7
y^-1 = 2.5
-1 < 0
1/(y^1) = 2.5 // * y^1
1 = 2.5*y^1 // : 2.5
0.4 = y^1
y = 0.4
y = 0.4
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