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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/(-2) = (4*v+4)/(2*v+14) // - (4*v+4)/(2*v+14)
2/(-2)-((4*v+4)/(2*v+14)) = 0
(-1*(4*v+4))/(2*v+14)-1 = 0
(-1*(4*v+4))/(2*v+14)+(-1*(2*v+14))/(2*v+14) = 0
-1*(4*v+4)-1*(2*v+14) = 0
-6*v-18 = 0
(-6*v-18)/(2*v+14) = 0
(-6*v-18)/(2*v+14) = 0 // * 2*v+14
-6*v-18 = 0
-6*v-18 = 0 // + 18
-6*v = 18 // : -6
v = 18/(-6)
v = -3
v = -3
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