$\left(x+11\right)\left(x-9\right)$
$-5x^2+4x+1=-6x-8$
$\left(4ab-7c\right)\left(ab+6c\right)$
$\frac{4-10w}{-4}$
$4x-2\ge\:2x-4$
$4-5\left(7\right)-7\left(7\right)$
$\frac{\left(sinxtanx\right)}{cosx+1}$
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