`5.(x-9)=350`
`x-9=350:5`
`x-9=70`
`x=70+9`
`x=79`
\(=>x-9=350:5\\ =>x-9=70\\ =>x=70+9\\ =>x=79\)
\(5\cdot\left(x-9\right)=350\\ \left(x-9\right)=350:5\\ \left(x-9\right)=70\\ x=70+9\\ x=79\)
5.(x-9)=350
(x-9)= 350 : 5
(x-9)=70
x = 70 + 9
x = 79