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D( v )
v = 0
5*v = 0
v = 0
v = 0
5*v = 0
5*v = 0
5*v = 0 // : 5
v = 0
v in (-oo:0) U (0:+oo)
7/v = (4*v-1)/(5*v) // - (4*v-1)/(5*v)
7/v-((4*v-1)/(5*v)) = 0
(-1*(4*v-1))/(5*v)+7/v = 0
(-1*v*(4*v-1))/(5*v*v)+(5*7*v)/(5*v*v) = 0
5*7*v-1*v*(4*v-1) = 0
36*v-4*v^2 = 0
36*v-4*v^2 = 0
4*v*(9-v) = 0
9-v = 0 // - 9
-v = -9 // * -1
v = 9
4*v*(v-9) = 0
(4*v*(v-9))/(5*v*v) = 0
(4*v*(v-9))/(5*v*v) = 0 // * 5*v*v
4*v*(v-9) = 0
( 4*v )
4*v = 0 // : 4
v = 0
( v-9 )
v-9 = 0 // + 9
v = 9
v in { 0}
v = 9
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