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D( v )
2*v+8 = 0
v-10 = 0
2*v+8 = 0
2*v+8 = 0
2*v+8 = 0 // - 8
2*v = -8 // : 2
v = -8/2
v = -4
v-10 = 0
v-10 = 0
v-10 = 0 // + 10
v = 10
v in (-oo:-4) U (-4:10) U (10:+oo)
6/(v-10) = 3/(2*v+8) // - 3/(2*v+8)
6/(v-10)-(3/(2*v+8)) = 0
6/(v-10)-3*(2*v+8)^-1 = 0
6/(v-10)-3/(2*v+8) = 0
(6*(2*v+8))/((v-10)*(2*v+8))+(-3*(v-10))/((v-10)*(2*v+8)) = 0
6*(2*v+8)-3*(v-10) = 0
9*v+78 = 0
(9*v+78)/((v-10)*(2*v+8)) = 0
(9*v+78)/((v-10)*(2*v+8)) = 0 // * (v-10)*(2*v+8)
9*v+78 = 0
9*v+78 = 0 // - 78
9*v = -78 // : 9
v = -78/9
v = -26/3
v = -26/3
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