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2x + 2 pomnożyć (3y - x) - 3 razy pomnożyć (2x + 1) =
2x+ 2(3y -x) - 3(2x + 1)=
= 2x + 6y - 2x - 6x - 3 =
= - 6x + 6y - 3
2x+6y - 2x - 6x - 3 =
2x - 2x - 6x = 6y - 3
- 6x = 6y -3 to jest najprostsza postać