a)[tex]7x - 5 + 2x - 4 = 7x + 2x - 5 - 4 = 9x - 9[/tex]
b)[tex] - 8x + 3m + 5x - 6m = - 8x + 5x + 3m - 6m = - 3x - 3m[/tex]
c)[tex]1.2x - 3.8 - 5.6x + 1.7 = 1.2x - 5.6x - 3.8 + 1.7 = - 4.4x - 2.1[/tex]
d)[tex] - 4.8 {x}^{2} - 4x + 5 {x}^{2} + 2.3x = - 4.8 {x}^{2} + 5 {x}^{2} - 4x + 2.3x = 0.2 {x}^{2} - 1.7x[/tex]
e)[tex]1 \frac{1}{3} x + \frac{5}{6} - 4 \frac{1}{2} x - 1.5 = \frac{4}{3} x - \frac{9}{2} x + \frac{5}{6} - \frac{15}{10} = \frac{8}{6} x - \frac{27}{6} x + \frac{50}{60} - \frac{90}{60} = - \frac{19}{6} x - \frac{40}{60} = - 3 \frac{1}{6} x - \frac{2}{3} [/tex]
