①3x-24=15×0.2
② x+50%x=25
③3(x+2)=4(x+1)
④ : = :x
⑤(x+12)× =42-x
⑥
①0.8:2.4=1.5:x
②9:x=1.8:5.6
③4: = :x
④x:10= :
⑤ =
⑥ :25%=x: