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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
210/v = 14 // - 14
210/v-14 = 0
210*v^-1 = 14 // : 210
v^-1 = 1/15
-1 < 0
1/(v^1) = 1/15 // * v^1
1 = 1/15*v^1 // : 1/15
15 = v^1
v = 15
v = 15
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