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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
531/v = 675/750 // - 675/750
531/v-(675/750) = 0
531/v-9/10 = 0
531*v^-1 = 9/10 // : 531
v^-1 = 1/590
-1 < 0
1/(v^1) = 1/590 // * v^1
1 = 1/590*v^1 // : 1/590
590 = v^1
v = 590
v = 590
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