$2f^2-32f+78=0$
$\left(3x+5\right)\left(x-8\right)$
$\frac{x^2-49}{x-7}$
$\frac{9x^{3}y^{2}}{3x^{2}w}$
$14-12+45-23+1$
$\left(\sec\beta+\frac{1}{\ctg\beta}\right)\left(\frac{1}{\cos\beta}-\tg\beta\right)$
$7x^{16}-7^{16}x$
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