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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
18/y+3*9 = 24 // - 24
18/y+3*9-24 = 0
18*y^-1 = -3 // : 18
y^-1 = -1/6
-1 < 0
1/(y^1) = -1/6 // * y^1
1 = -1/6*y^1 // : -1/6
-6 = y^1
y = -6
y = -6
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