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D( u )
0.7*10*u = 0
0.7*10*u = 0
0.7*10*u = 0
7*u = 0 // : 7
u = 0
u in (-oo:0) U (0:+oo)
6/(0.7*10*u) = 0
6/7*u^-1 = 0 // : 6/7
u^-1 = 0
u należy do O
u belongs to the empty set
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