$r^6z^2\cdot7r^4z^5\cdot2rz^4$
$36x^2+48x$
$\frac{6x^2-11x-32}{\left(x+6\right)\left(x+1\right)^2}$
$\tan\left(x\right)^2+\sec\left(x\right)^2-3\:=\:0$
$9g^2+6g-9$
$3a-4a+5a-7a+12a$
$22x+33n-11m$
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