Odpowiedź:
[tex]a) \: - 6x + 12 {x}^{2} = 12 {x}^{2} - 18x \\ 6x = 0 \\ x = 0 \\ \\ b) \: 3 - 6x + 2 {x}^{2} = 2 {x}^{2} - 3x - 6 \\ - 3x = - 9 \\ x = 3 \\ [/tex]
[tex]c) \: 4x - 6 {x}^{2} - 2 + 3x = 4x + 6 - 6 {x}^{2} - 9x \\ 3x = 9 \\ x = 3 \: \\ \\ d) \: 12 {x}^{2} - 8x - 9 + 6 - 12 {x}^{2} + 18x - 8x + 12 = 4 \\ \\ 2x = - 5 \\ x = - 2.5[/tex]