2x+30%x=13.8 13:x=6.5:4
:x=: 2:=3.6:x 12-4x=2.4
2x﹣13=39 13x﹣7.5x=3.4
2x+2.7=24.7 x-x= =
40%x+25=45 x-15%x=17 2x+30%x=18.4
4x÷(1-65%)=80 120%x-x=0.8 49+40%x=89