Solve :
$5 x^{2} - 20 x + 15 = 0$

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Solution

$5 x^{2} - 20 x + 15 = 0$
$5 x^{2} - 15 x - 5 x + 15 = 0$
$5 x (x - 3) - 5 (x - 3) = 0$
$(x - 3) (5 x - 5) = 0$
$x = 3, 1$

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