2x+30%x=13.8 13:x=6.5:4
:x=: 2:=3.6:x 12-4x=2.4
x:=0.5: = 0.2x-1.5=
3.75:x=3:12 (x-0.6)× =2.25 25%: =x:
x÷=4 x+60%x=22 3.6 :1.2=
8:5=24:x :=4:x =
①2x﹣4×0.5=4
②:=x: