$x^{2} + 14 x - 15$ =0 .solve it.

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Solution

$x^{2} + 14 x - 15 = 0$
$x^{2} + 15 x - x - 15 = 0$
$x (x + 15) - 1 (x + 15) = 0$
$(x - 1) (x + 15) = 0$
$x = 1, - 15$

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