$5xy-7xyz+3yx+8zx-4yxz+12xy$
$12x^22-x-6$
$-5r+\:8r\:+\:5$
$2\log x-\log\frac{x}{10}=3$
$\left(x-z\right).\left(x+3\right)$
$\sqrt{x^2}-2x$
$\lim_{x\to2}5\sqrt{x}$
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