Odpowiedź:
1.
[tex] =4x - 2y + 3 - 6x + 4y + 3 + 2x + 7y - 8 = 9y - 2[/tex]
2.
[tex] = - 8 {x}^{2} - 12xy + 20x[/tex]
3.
[tex] = { - 6x}^{2} + 12x - 24 {x}^{2} + 40x = - 30 {x}^{2} + 52x[/tex]
4.
[tex] = - 8 {x}^{2} - 20x + 6x + 15 + {8x}^{2} - 16x = - 30x + 15[/tex]
5.
[tex] {6x}^{2} - 4x - 3x + 2 - {12x}^{2} + 3x + 16x - 4 = - 6 {x}^{2} 12x - 2[/tex]
