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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-(1/6)+1/3 = 0
5/y-1/6+1/3 = 0
5*y^-1 = -1/6 // : 5
y^-1 = -1/30
-1 < 0
1/(y^1) = -1/30 // * y^1
1 = -1/30*y^1 // : -1/30
-30 = y^1
y = -30
y = -30
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