①8x÷2=23
②7(x+3.2)÷2=28
③9x-4.8=3x-1.2
④3.6x-x-0.1x=0.75
①20+x=35 ②3x+6x=81 ③8x-24=80
2x+5.4=18.9 2x-2.8=9.96 (x-0.8)×4=7.2
2x+5=17 3(x-2)=12
① ② ③
⑴6x-9=33 ⑵y+3y=28.4