Simplifying
$4x^2-2x^3y+6xy^2$
$3-4r-2r+5$
$\int\:\frac{x}{x-5}dx$
$-2x-3<6x-3$
$10x^2+13x-3$
$\lim_{x\to\infty}\left(1-\frac{1}{x}\right)^{2x}$
$8.4+8.5+8.5+8.6+8.6+8.6+8.7+8.7+8.7+8.7+8.9+8.9+9.3+9.3+9.3+9.5+9.5+9.6+9.7+9.7$
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