$6ab-9xy-8ab+xy-12ab$
$\frac{r}{16}<1$
$x^2+2x-224$
$\frac{1}{2}b-\frac{3}{7}b$
$\frac{\sec\left(a\right)-\csc\left(a\right)}{\tan\left(a\right)+\cot\left(a\right)}$
$\left(2.1\:x\:h\right)\:x\:3$
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