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D( v )
2*v+14 = 0
2*v+14 = 0
2*v+14 = 0
2*v+14 = 0 // - 14
2*v = -14 // : 2
v = -14/2
v = -7
v in (-oo:-7) U (-7:+oo)
2/(-3) = (4*v+4)/(2*v+14) // - (4*v+4)/(2*v+14)
2/(-3)-((4*v+4)/(2*v+14)) = 0
(-1*(4*v+4))/(2*v+14)-2/3 = 0
(-1*3*(4*v+4))/(3*(2*v+14))+(-2*(2*v+14))/(3*(2*v+14)) = 0
-1*3*(4*v+4)-2*(2*v+14) = 0
-16*v-40 = 0
(-16*v-40)/(3*(2*v+14)) = 0
(-16*v-40)/(3*(2*v+14)) = 0 // * 3*(2*v+14)
-16*v-40 = 0
-16*v-40 = 0 // + 40
-16*v = 40 // : -16
v = 40/(-16)
v = -5/2
v = -5/2
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