Question

(x-2)^2=(x-9)^2 быстро

Answer 1

$x^{2}$ - 4x + 4 = $x^{2}$ - 18x + 81
$x^{2}$ - $x^{2}$ - 4x + 18x = 81 - 4
14x = 77
x = 5,5