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D( f )
f = 0
2*f-1 = 0
f = 0
f = 0
2*f-1 = 0
2*f-1 = 0
2*f-1 = 0 // + 1
2*f = 1 // : 2
f = 1/2
f in (-oo:0) U (0:1/2) U (1/2:+oo)
1/f-(5/(2*f-1)) = 0
1/f-5*(2*f-1)^-1 = 0
1/f-5/(2*f-1) = 0
(-5*f)/(f*(2*f-1))+(1*(2*f-1))/(f*(2*f-1)) = 0
1*(2*f-1)-5*f = 0
-3*f-1 = 0
(-3*f-1)/(f*(2*f-1)) = 0
(-3*f-1)/(f*(2*f-1)) = 0 // * f*(2*f-1)
-3*f-1 = 0
-3*f-1 = 0 // + 1
-3*f = 1 // : -3
f = 1/(-3)
f = -1/3
f = -1/3
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