$12\left(7-4\right)-2\:x\:3$
$2a-\left(2a-3b\right)+\left(4a+5\right)-\left(7-3a\right)$
$a=-3,b=-4,c=-5$
$-32x^4+16x^2+8$
$\lim_{x\to4}\frac{x^2-16}{\sqrt{x}-2}$
$\frac{\frac{sin\left(x\right)^2}{cos\left(x\right)}}{\frac{1}{cosx}-1}$
$49x^4y^2-64w^{10}z^{14}$
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