$5z-4z$
$\frac{5.5-2}{9-2}$
$\log\left(0\right)+3$
$6+\left(8-3\right)-6-\left(-7-4\right)$
$9p^2-12p+4$
$\frac{\sin\left(3a\right)-\sin\left(a\right)}{\cos\left(3a\right)+\cos\left(a\right)}=\tan\left(a\right)$
$\frac{x^3+8x^2-7}{x-7}$
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