$\left(2a\right)\left(-5b\right)$
$24x+6mn^2-30mn-12x$
$2x:x^2$
$x^2+5-10$
$\left(\left(3x-y\right)+2x^2\right)\left(3z+\left(3x-y\right)\right)$
$-37a^4b^7+128a^4b^7$
$2x-13<x+42$
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