$\frac{20}{2x}$
$7\left(2-z\right)$
$57x-32<72$
$\left(8z-x\right)^2$
$\frac{dy}{dx}=3x-4$
$\left(y+12\right)^2$
$7^3+x^2-7x^3-8x+12$
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