`5 (x-9) = 350`
`=>x-9 = 350:5=70`
`=> x=70+9=79`
Vậy `x=79`
5 ( x - 9 ) = 350
x - 9 = 350 : 5
x - 9 = 70
x = 70 + 9
x = 79
\(\Leftrightarrow x-9=350:5\\ \Leftrightarrow x-9=70\\ \Leftrightarrow x=79\)
\(5\left(x-9\right)=350\)
\(x-9=350\div5\)
\(x-9=70\)
\(x=70+9\)
\(x=79\)