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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/2.5 = 35/y // - 35/y
7/2.5-(35/y) = 0
7/2.5-35*y^-1 = 0
-35*y^-1 = -2.8 // : -35
y^-1 = 0.08
-1 < 0
1/(y^1) = 0.08 // * y^1
1 = 0.08*y^1 // : 0.08
12.5 = y^1
y = 12.5
y = 12.5
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