Răspuns:
[tex]7 {x}^{3} - 8x + 9x - 4 {x}^{3} - 11x - 6 {x}^{3} = \\ = 7 {x}^{3} - 6 {x}^{3} - {4x}^{3} - 8x + 9x - 11x = \\ = {x}^{3} - 4 {x}^{3} + x - 11x = \\ = - 3 {x}^{3} - 10x[/tex]
