helppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp

`a)2x-138=3^2. 2^3`

`2x-138=9.8`

`2x-138=72`

`2x=72+138`

`2x=210`

`x=210:2`

`x=105`

`-`Vậy : `x=105.`

`-------`

`b)x=2^4+3^2 . 3^2`

`x=16+3^4`

`x=16+81`

`x=97`

`-`Vậy : `x=97.`

`-------`

`c)6x-39=588:28`

`6x-39=21`

`6x=21+39`

`6x=60`

`x=60:6`

`x=10`

`-`Vậy : `x=10.`

`-------`

`d)42x+37.42=39.42`

`42x=39.42-37.42`

`42x=42.(39-37)`

`42x=42.2`

`=>x=2`

`-`Vậy : `x=2.`

`-------`

`e)71+(26-3x):5=75`

`(26-3x):5=75-71`

`(26-3x):5=4`

`26-3x=4.5`

`26-3x=20`

`3x=26-20`

`3x=6`

`x=6:3`

`x=2`

`-`Vậy : `x=2.`

`-------`

`f)x-17=(-8)-17`

`x=-8-17+17`

`x=-8`

`-`Vậy : `x=-8.`

`-------`

`g)(5x-2).6^3=3.6^5`

`5x-2=3.6^5:6^3`

`5x-2=3.6^2`

`5x-2=3.36`

`5x-2=108`

`5x=108+2`

`5x=110`

`x=110:5`

`x=22`

`-`Vậy : `x=22.`

`-------`

`h)(3x-2^4).7^3=2.7^4`

`3x-2^4=2.7^4:7^3`

`3x-16=2.7`

`3x-16=14`

`3x=14+16`

`3x=30`

`x=30:3`

`x=10`

`-`Vậy : `x=10.`

`-------`

`i)4-(27-3)=x-(13-4)`

`x-9=4-24`

`x-9=-20`

`x=-20+9`

`x=-11`

`-`Vậy : `x=-11.`

`-------`

`j)7-x=8-(-7)`

`7-x=8+7`

`x=7-8-7`

`x=-8`

`-`Vậy : `x=-8.`

`-------`

`k)2x-6=(-3)-(-7)`

`2x-6=-3+7`

`2x-6=4`

`2x=4+6`

`2x=10`

`x=10:2`

`x=5`

`-`Vậy : `x=5.`

`-------`

`l)10+2x=4^5:4^3`

`10+2x=4^2`

`10+2x=16`

`2x=16-10`

`2x=6`

`x=6:2`

`x=3`

`-`Vậy : `x=3.`