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x=3,33333..... /*10
10x=33,333.... - odejmowanie obu równań
-9x=-30 /:(-9)
x=30/9
b) 0,2(1)
x=0,21111... /*100
100x=21,111111
10x=2,1111111 -
90x=19 /:90
x=19/90