$xy^{1\:}=4y$
$a\left(x-1\right)+1-x$
$m^2+8m+12$
$.09y^2-100$
$x^26x+25$
$\left(20\:-\:18\::\:2\right)$
$_{\left(2-x\right)-3\left(6+8x\right)-12}$
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