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DAJE NAJ I SERCE !!!!!!!!!!! (na teraz)

-2x + 3y – x +7y – 10 =

14xy – 4x + 6y – 8xy +5x – xy =

2a + (3a – 2b) – (a +4b) =

- (- 5x -8) + (12 – 8x) =