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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
50/y-(50/y)+8 = 3/y // - 3/y
50/y-(50/y)-(3/y)+8 = 0
50/y-50*y^-1-3*y^-1+8 = 0
-3*y^-1 = -8 // : -3
y^-1 = 8/3
-1 < 0
1/(y^1) = 8/3 // * y^1
1 = 8/3*y^1 // : 8/3
3/8 = y^1
y = 3/8
y = 3/8
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