$12x-8>4x$
$49k^2\:-\:56k\:+\:16$
$4x^4y^2\cdot4y^3z^3$
$\left(5r\:-\:7f\:-\:2\right)^2$
$\frac{2x^3-x^2-19x+15}{x-3}$
$30x^2+3x-2$
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