$a^4b^2-c^2$
$x^3+9x^2+24x+20$
$3x^2-x+x^2+3x$
$2x\cdot2.5$
$5x^2+40x=0$
$257^2$
$\frac{x}{3}+\frac{x}{2}+\frac{x}{6}>5$
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