$5+2x=7$
$49x^3+14^2+x$
$6x^3+2x^2+3x-4:\:\:x^2+3x\:+4$
$\left(\frac{1}{2}m-\frac{2}{5}n\right).\left(\frac{1}{4}m+\frac{2}{5}n\right)$
$\frac{w^2-36}{w-6}$
$\left(x^2-4y^4\right)^2$
$4x^2-19x+22=0$
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