$\left(4x^2-6\right)\left(4x^2-3\right)$
$7y+2<5y+12$
$\left(mn-4\right)^2$
$\frac{d}{dx}x^9y^9-y=x$
$\left(1-2m+5m^2\right)\left(8-6m\right)$
$13^2\cdot13^{-2}$
$8x^2+16x=42$
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