`@` `\text {Ans}`
`\downarrow`
`4,`
`a)`
`(x-14) - 20 = 0`
`=> x-14=0+20`
`=> x - 14=20`
`=> x=20+14`
`=> x=34`
Vậy, `x=34`
`b)`
`25-(2*x+10)=5`
`=> 2x+10=25-5`
`=> 2x+10=20`
`=> 2x=20-10`
`=> 2x=10`
`=> x=10 \div 2`
`=> x=5`
Vậy, `x=5`
`c)`
`315-(135-x)=215`
`=> 135-x=315-215`
`=> 135-x=100`
`=> x=135-100`
`=> x=35`
Vậy,` x=35`
`d)`
`128+(202-x)=330`
`=> 202-x=330-128`
`=> 202-x=202`
`=> x=202-202`
`=> x=0`
Vậy, `x=0`
`e)`
`x-320 \div 32=25*16`
`=> x- 10 = 400`
`=> x=400+10`
`=> x=410`
Vậy, `x=410`
`f)`
`(x-120)*9=450`
`=> x-120=450 \div 9`
`=> x-120=50`
`=> x=50+120`
`=> x=170`
Vậy, `x=170`
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