[tex]a)\\\\O= 2x+ \frac{1}{2}+4x-4+3x-0,5=9x+\frac{1}{2}-\frac{1}{2}=9x\\\\b)\\\\O=4,5x-4+3+1,2x+4,3x+5-x=9x+4\\\\c)\\\\O=2*2\frac{2}{3}x+2(4,5- \frac{2}{3}x)=2* \frac{8}{3}x+9- \frac{4}{3}x =\frac{16}{3}x+9-\frac{4}{3}x=\frac{12}{3}x+9=4x+9[/tex]
[tex]d)\\\\ \frac{2}{3}x+0,2+8-2x+ 0,(3) x+2+2y+ \frac{1}{2}+4,5-y= \\\\= \frac{2}{3}x+ \frac{2}{10}+8-2x+ \frac{1}{3} x+2+2y+ \frac{5}{10}+ 4\frac{5}{10}-y=\\\\= \frac{3}{3}x-2x+ y +14\frac{12}{10} = x-2x+ y +15\frac{ 2}{10}=-x+y+15\frac{1}{5}[/tex]
