4.
a)
[tex]L = 3x-0,5 + 2x + \frac{1}{2}+4x-4 = 9x-4[/tex]
b)
[tex]L = 5-x+4,5x-4+3+1,2x+4,3x = 9x + 4[/tex]
c)
[tex]L = 2(4,5-\frac{2}{3}x) + 3\cdot2\frac{2}{3}x = 9-\frac{4}{3}x + 2\cdot\frac{8}{3}x =9-\frac{4}{3}x +\frac{16}3}x = 9+\frac{12}{3}x = 9+4x[/tex]
