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D( v )
v-6 = 0
v-6 = 0
v-6 = 0
v-6 = 0 // + 6
v = 6
v in (-oo:6) U (6:+oo)
7 = 5/(v-6) // - 5/(v-6)
7-(5/(v-6)) = 0
7-5*(v-6)^-1 = 0
7-5/(v-6) = 0
(7*(v-6))/(v-6)-5/(v-6) = 0
7*(v-6)-5 = 0
7*v-47 = 0
(7*v-47)/(v-6) = 0
(7*v-47)/(v-6) = 0 // * v-6
7*v-47 = 0
7*v-47 = 0 // + 47
7*v = 47 // : 7
v = 47/7
v = 47/7
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