Solve :
$5 x^{2} + 7 x + 2 = 0$

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Solution

$5 x^{2} + 7 x + 2 = 0$
$5 x^{2} + 5 x + 2 x + 2 = 0$
$5 x (x + 1) + 2 (x + 1) = 0$
$(x + 1) (5 x + 2) = 0$
$x = - 1, - \frac{2}{5}$

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