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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-8/v-2 = 5 // - 5
-8/v-5-2 = 0
-8*v^-1 = 7 // : -8
v^-1 = -7/8
-1 < 0
1/(v^1) = -7/8 // * v^1
1 = -7/8*v^1 // : -7/8
-8/7 = v^1
v = -8/7
v = -8/7
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