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D( v )
v-(1/5) = 0
v-(1/5) = 0
v-(1/5) = 0
v-1/5 = 0
v-1/5 = 0 // + 1/5
v = 1/5
v in (-oo:1/5) U (1/5:+oo)
((2*v)/11-2)/(v-(1/5)) = 0
((2*v)/11-2)/(v-1/5) = 0
(2/11*v-2)/(v-1/5) = 0
2/11*v-2 = 0 // + 2
2/11*v = 2 // : 2/11
v = 2/2/11
v = 11
v = 11
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