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D( x )
1.43^x = 0
1.43^x = 0
1.43^x = 0
x należy do O
x in (-oo:+oo)
(2.86^x)/(1.43^x) = 0
(2.86^x)/(1.43^x) = 0 // * 1.43^x
2.86^x = 0
x należy do O
x belongs to the empty set
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