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D( v )
v-1 = 0
v+2 = 0
v-1 = 0
v-1 = 0
v-1 = 0 // + 1
v = 1
v+2 = 0
v+2 = 0
v+2 = 0 // - 2
v = -2
v in (-oo:-2) U (-2:1) U (1:+oo)
5/(v-1)+8 = 7/(v+2) // - 7/(v+2)
5/(v-1)-(7/(v+2))+8 = 0
5/(v-1)-7*(v+2)^-1+8 = 0
5/(v-1)-7/(v+2)+8 = 0
(5*(v+2))/((v-1)*(v+2))+(-7*(v-1))/((v-1)*(v+2))+(8*(v-1)*(v+2))/((v-1)*(v+2)) = 0
5*(v+2)-7*(v-1)+8*(v-1)*(v+2) = 0
8*v^2-2*v+8*v-16+17 = 0
8*v^2+6*v+1 = 0
8*v^2+6*v+1 = 0
8*v^2+6*v+1 = 0
DELTA = 6^2-(1*4*8)
DELTA = 4
DELTA > 0
v = (4^(1/2)-6)/(2*8) or v = (-4^(1/2)-6)/(2*8)
v = -1/4 or v = -1/2
(v+1/2)*(v+1/4) = 0
((v+1/2)*(v+1/4))/((v-1)*(v+2)) = 0
((v+1/2)*(v+1/4))/((v-1)*(v+2)) = 0 // * (v-1)*(v+2)
(v+1/2)*(v+1/4) = 0
( v+1/2 )
v+1/2 = 0 // - 1/2
v = -1/2
( v+1/4 )
v+1/4 = 0 // - 1/4
v = -1/4
v in { -1/2, -1/4 }
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