Odpowiedź:
2a-2b-5a-5b+8a-12b= 5a-19b
2a+2b-5a+5b+8a-12b=5a-5b
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Odpowiedź:
2a-2b-5a-5b+8a-12b= 5a-19b
Odpowiedź:
2a+2b-5a+5b+8a-12b=5a-5b