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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-8 = -7/v-1 // + -7/v-1
1-(-7/v)-8 = 0
7*v^-1-8+1 = 0
7*v^-1 = 7 // : 7
v^-1 = 1
-1 < 0
1/(v^1) = 1 // * v^1
1 = 1*v^1 // : 1
1 = v^1
v = 1
v = 1
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