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D( y )
3*y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
y in (-oo:0) U (0:+oo)
4/(3*y) = 8/9 // - 8/9
4/(3*y)-(8/9) = 0
4/(3*y)-8/9 = 0
4/3*y^-1 = 8/9 // : 4/3
y^-1 = 2/3
-1 < 0
1/(y^1) = 2/3 // * y^1
1 = 2/3*y^1 // : 2/3
3/2 = y^1
y = 3/2
y = 3/2
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