14ab-21b
_________; надо сокротить
12a²-18a
14ab-21b 7b(2a-3) 7b
-------------=------------=---------
12a^2-18a 6a(2a-3) 6a
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14ab-21b 7b(2a-3) 7b
-------------=------------=---------
12a^2-18a 6a(2a-3) 6a