$2\sqrt{2}-2\sqrt{2}+\sqrt{2}$
$3x^2-12x-180$
$13x-18<-90$
$16x-20y=-5\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(\frac{1}{3}m+\frac{2}{5}\right)\left(\frac{1}{3}m-\frac{1}{2}\right)$
$\left(2a+b+3c\right)^2$
$x^2y'=4x^2+7xy+2y^2$
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