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D( v )
v^9 = 0
v^9 = 0
v^9 = 0
1*v^9 = 0 // : 1
v^9 = 0
v = 0
v in (-oo:0) U (0:+oo)
1000/(v^9)+8 = 15 // - 15
1000/(v^9)-15+8 = 0
1000*v^-9 = 7 // : 1000
v^-9 = 7/1000
-9 < 0
1/(v^9) = 7/1000 // * v^9
1 = 7/1000*v^9 // : 7/1000
1000/7 = v^9
v^9 = 1000/7 // ^ 1/9
v = (1000/7)^(1/9)
v = (1000/7)^(1/9)
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