$\left(6x+2a\right)\left(3x+4a\right)$
$\frac { 7 x - 4 } { x + 9 } - 15$
$\frac{\sec-1}{\tan^2}$
$\sqrt{-49}$
$\frac{8^7}{8^2}$
$x^2-20x+19=0$
$\left(x+5\right)\left(2x+2\right)$
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