$\left(3x+60\right)\left(x-80\right)$
$-11\:x\:24$
$\frac{32x-20}{\left(x-1\right)\left(5x-3\right)}$
$x'=bx$
$9-6x+5$
$\left(-9\right)^2\left(-9\right)^2$
$15\tan^2a+14\tan a-8$
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