$\frac{8x^2+16x+6}{2x+1}$
$00a^{2}-140ab+49b^{2}$
$\:y^6+2y^3+1$
$\lim_{x\to0}\left(1+\frac{3x}{x^2+1}\right)$
$x^2+2x+4x+2$
$\frac{y^8}{y^7}$
$-40m^3+144m+m^5$
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