$\frac{7-81}{5x^3b^3-9}$
$\frac{20}{-5}+\frac{12}{-2}$
$\sin\left(8x\right)\cos\left(3x\right)$
$\lim_{x\to1}\left(\frac{x^n-1}{n\left(x-1\right)}\right)$
$19x^2y-4xy^2+5xy^2-16x^2y$
$17ab-3ab+5ab+3x$
$-89\cdot24$
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