` a) ` ` \frac{x - 1}{x - 5} = 6/7 `
` => 7.(x - 1) = 6 . (x - 5) `
` => 7x - 7 = 6x - 30 `
` => 7x - 6x = - 30 + 7 `
` => x = -23 `
` b) ` ` \frac{x + 2}{5} = \frac{x - 1}{2} `
` => 2.(x + 2) = 5.(x - 1) `
` => 2x + 4 = 5x - 5 `
` => 2x - 5x = - 5 - 4 `
` => -3x = -9 `
` => x = 3 `