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D( y )
3*y = 0
y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/(3*y)-(5/y) = 1 // - 1
2/(3*y)-(5/y)-1 = 0
2/(3*y)-5*y^-1-1 = 0
-13/3*y^-1 = 1 // : -13/3
y^-1 = -3/13
-1 < 0
1/(y^1) = -3/13 // * y^1
1 = -3/13*y^1 // : -3/13
-13/3 = y^1
y = -13/3
y = -13/3
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