$24+2\cdot43$
$2a^4\cdot2b^2$
$lnx-ln5=4$
$-9\cdot\left(-9+6\right)$
$x-3+x$
$x\:-\:2\:<=\:2x\:-5$
$9x^{4}-24x^{2}y+16y^{2}$
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