Odpowiedź :
[tex] - 4xy - 5x - 9 - ... = - 6xy - x - 2[/tex]
[tex] - 4xy - 2xy = - 6xy \\ - 5x + 6x = x \\ - 9 + 7 = 2[/tex]
[tex] - 4xy - 5x - 9 - 2xy + 6x + 7 = - 6xy - x - 2[/tex]
[tex] - 4xy - 5x - 9 - ... = - 6xy - x - 2[/tex]
[tex] - 4xy - 2xy = - 6xy \\ - 5x + 6x = x \\ - 9 + 7 = 2[/tex]
[tex] - 4xy - 5x - 9 - 2xy + 6x + 7 = - 6xy - x - 2[/tex]