Question

Giải chi tiết giúp m vơia

Answer 1

`90-2(3x+1)=7.10`

`90-2(3x+1)=70`

`2(3x+1)=90-70`

`2(3x+1)=20`

`3x+1=10`

`3x=9`

`x=3`

Answer 2

90 - 2(3x +1)=7x10

2(3x+1)=90-70=20

3x+1=10

3x=9

x=3

Answer 3

\(90-2\left(3x+1\right)=70\\ 2\left(3x+1\right)=90-70\\ 2\left(3x+1\right)=20\\ 3x+1=20:2\\ 3x+1=10\\ 3x=10-1\\ 3x=9\\ x=3\)