`x-23=67`
`=>x=67+23`
`=>x=90`
Vậy `x=90`
__
`57 +7x=120`
`=> 7x=120-57`
`=>7x=63`
`=>x=63:7`
`=>x=9`
vậy `x=9`
__
`38-2x=14`
`=>2x=38-14`
`=>2x= 24`
`=>x=24:2`
`=>x=12`
__
`140:(x-8)=7`
`=> x-8=140:7`
`=>x-8=20`
`=>x=20+8`
`=>x=28`
__
`(2+x):5=6`
`=>2+x=6xx5`
`=>2+x=30`
`=>x=30-2`
`=>x=28`
Vậy `x=28`
__
`2(x-51)=24`
`=>x-51=24:2`
`=>x-51= 12`
`=>x=12+51`
`=>x=63`
Vậy `x=63`
\(a)x-23=67\\\Rightarrow x=67+23\\\Rightarrow x=90\\---\\b)57+7x=120\\\Rightarrow 7x=120-57\\\Rightarrow7x=63\\\Rightarrow x=63:7\\\Rightarrow x=9\\---\\c)38-2x=14\\\Rightarrow 2x=38-14\\\Rightarrow 2x=24\\\Rightarrow x=24:2\\\Rightarrow x=12\\---\)
\(f)140:(x-8)=7\\\Rightarrow x-8=140:7\\\Rightarrow x-8=20\\\Rightarrow x=20+8\\\Rightarrow x=28\\---\\g)(2+x):5=6\\\Rightarrow 2+x=6\cdot5\\\Rightarrow 2+x=30\\\Rightarrow x=30-2\\\Rightarrow x=28\)
#\(Toru\)
