$3n+5p+2+n$
$6x^2\:-\:6x\:-\:120$
$3^2+2ab+b^2$
$6m-9n+21nx-14mx$
$\frac{10x^3+20x^2-5x-19}{6x^2-4}$
$-5+x<3$
$\int\sqrt{19+18x-x^2}dx$
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