$2y-3x+6z+23x-22y+14z$
$\left(5x\right)\left(3x+2\right)$
$9m^2-4n^2$
$9x^{4}-24x^{2}y+16y^{2}$
$a^2+2-7+2a+5$
$\frac{d}{dx}\sin x^2+\cos x^2=0$
$18.3-12$
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