0.12x=0.3 0.5x-7=3.6
x-x= :x=0.3:0.5
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