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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6-(5/v)-2 = -6/v-2 // + -6/v-2
2-(5/v)-(-6/v)-2+6 = 0
6*v^-1-5*v^-1-2+2+6 = 0
1*v^-1 = -6 // : 1
v^-1 = -6
-1 < 0
1/(v^1) = -6 // * v^1
1 = -6*v^1 // : -6
-1/6 = v^1
v = -1/6
v = -1/6
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