Zapisz w jak najprostszej postaci:
x - mnożenie
12b x b-1 + 14 x b2 - 2b - b-b2
----- ----- -------
4 21 3
============================
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12b x b-1 + 14 x b2 - 2b - b-b2
----- ----- -------
4 21 3
============================