①6.6x-5x=64
②0.8×1.25+4x=5.4
③7x÷0.5=2.8
④2x+0.35=7.25
⑤7.5÷2.5+x=10.2
⑥5.2-2x=1.8
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