$wx-3wx+3z-xz$
$\frac{4+16x+20x^2+12x^3}{4x^2+2}$
$\:\frac{2x+6}{4x^2-12x+9}$
$-10-4n+7$
$\left(-95\right)-\left(-20\right)$
$4x+2<6$
$3x-7<9$
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