Đáp án:
`x=120`
Giải thích các bước giải:
`x/120+1/4+x/100-9/20=x/60`
`=>x/120+1/4+x/100-9/20-x/60=0`
`=>(x/120-x/60)+(1/4-9/20)+x/100=0`
`=>(x/120-(x2)/120)+(-1)/5+x/100=0`
`=>(x-x2)/120-1/5+x/100=0`
`=>((x-x2)/120+x/100)-1/5=0`
`=>((x-x2)5)/600+(x6)/600=1/5`
`=>(x5-x10)/600+(x6)/600=1/5`
`=>(x.(-5)+x6)/600=1/5`
`=>(x.(-5+6))/600=1/5`
`=>(x.1)/600=1/5`
`=>x/600=1/5`
`=>x.5=1.600`
`=>x=600÷5`
`=>x=120`
