$\frac{n+2}{4n^2-20}$
$4y-29-9y+36$
$5x+15y=30$
$x^2+4x=12$
$3x-14<-2$
$-5x^3+2x+\frac{-6}{x}+2$
$\sqrt{28w}+\sqrt{63w}$
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