Solve:
$x^{2} + 7 x - 98 = 0$

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Solution

$x^{2} + 7 x - 98 = 0$
$x^{2} + 14 x - 7 x - 98 = 0$
$x (x + 14) - 7 (x + 14) = 0$
$(x - 7) (x + 14) = 0$
$x = 7$ or $x = - 14$ .

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