Solve:
$x^{2} - 30 x + 225 = 0$

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Solution

$x^{2} - 30 x + 225 = 0 x^{2} - 15 x - 15 x + 225 = 0 x (x - 15) - 15 (x - 15) = 0 (x - 15)^{2} = 0 x = 15$

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