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D( v )
v-2 = 0
v+4 = 0
v-2 = 0
v-2 = 0
v-2 = 0 // + 2
v = 2
v+4 = 0
v+4 = 0
v+4 = 0 // - 4
v = -4
v in (-oo:-4) U (-4:2) U (2:+oo)
3/(v-2) = 4/(v+4) // - 4/(v+4)
3/(v-2)-(4/(v+4)) = 0
3/(v-2)-4*(v+4)^-1 = 0
3/(v-2)-4/(v+4) = 0
(3*(v+4))/((v-2)*(v+4))+(-4*(v-2))/((v-2)*(v+4)) = 0
3*(v+4)-4*(v-2) = 0
20-v = 0
(20-v)/((v-2)*(v+4)) = 0
(20-v)/((v-2)*(v+4)) = 0 // * (v-2)*(v+4)
20-v = 0
20-v = 0 // - 20
-v = -20 // * -1
v = 20
v = 20
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