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`x.(x - 3) - x^2 + 4x - 5 = 0`

`<=> x^2 - 3x - x^2 + 4x - 5 = 0`

`<=> (x^2 - x^2) - (3x - 4x) = 5`

`<=> x = 5`

Vậy `x = 5`

$\\$

`(x - 3).(x + 3) - x^2 - 3x + 4 = 0`

`<=> x^2 - 9 - x^2 - 3x + 4 = 0`

`<=> (x^2 - x^2) - 3x - (9 - 4) = 0`

`<=> -3x - 5 = 0`

`<=> -3x = 5`

`<=> x = (-5)/3`

Vậy `x = (-5)/3`

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