`357 - 3 . (31 - 2x) = 342`
`3 . (31 - 2x) = 357 - 342`
`3 . (31 - 2x) = 15`
`31 - 2x = 5`
`2x = 26`
`x = 13`
`67 + 5 . (3x - 15) = 367`
`5 . (3x - 15) = 300`
`3x - 15 = 60`
`3x = 75 `
`x = 25`
`7 . (52 – 3x) – 25 = 192`
`7 . (52 – 3x) = 217`
`52 - 3x = 31`
`3x = 21`
` x = 7`