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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
0.34/4.25 = 8/y // - 8/y
0.34/4.25-(8/y) = 0
0.34/4.25-8*y^-1 = 0
-8*y^-1 = -0.08 // : -8
y^-1 = 0.01
-1 < 0
1/(y^1) = 0.01 // * y^1
1 = 0.01*y^1 // : 0.01
100 = y^1
y = 100
y = 100
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