a) 8-2x+1+x=9-x
b) 5x+2-2-2x=3x
c) [tex]1\frac{1}{3}x*\frac{4}{3}=\frac{8}{9}x\\[/tex]
d) [tex]\frac{13}{10} :\frac{1}{3} =3,9[/tex]
