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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 7/16.8 // - 7/16.8
5/y-(7/16.8) = 0
5/y-0.41666667 = 0
5*y^-1 = 0.41666667 // : 5
y^-1 = 0.08333333
-1 < 0
1/(y^1) = 0.08333333 // * y^1
1 = 0.08333333*y^1 // : 0.08333333
12.00000048 = y^1
y = 12.00000048
y = 12.00000048
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