$\frac{2}{\frac{13}{6}-2}-\frac{10}{1}$
$\left(x+y-2\right)^2$
$345\cdot\left(-93\right)+115.2$
$\frac{1}{1-tan\left(x\right)}-\frac{1}{1+tan\left(x\right)}=-\tan\left(x\right)$
$36x^2-19x-42$
$2a\:+\:6\:=\:3a\:-\:1$
$4-x=4x^2-20x+25$
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