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D( a )
13599273702913/a = 0
a = 0
13599273702913/a = 0
13599273702913/a = 0
13599273702913*a^-1 = 0 // : 13599273702913
a^-1 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a = 13599273702913/(13599273702913/a) // - 13599273702913/(13599273702913/a)
a-(13599273702913/(13599273702913/a)) = 0
a-a = 0
0 = 0
a należy do R
a in (-oo:0) U (0:+oo)
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