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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/y+34/y = 5 // - 5
11/y+34/y-5 = 0
45*y^-1 = 5 // : 45
y^-1 = 1/9
-1 < 0
1/(y^1) = 1/9 // * y^1
1 = 1/9*y^1 // : 1/9
9 = y^1
y = 9
y = 9
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