$u\:\cdot\:x^{-n}$
$\left(4x+3\right)\left(-4y+5\right)$
$3x\left(2x^2-5x-1\right)-4x\left(2x-5\right)$
$-5+2\cdot3$
$y'+\frac{2y}{x}=3e^2$
$2m+3y-7m+3y-2y-m-m$
$\lim_{x\to4}\left(\frac{8x+40}{x^2-25}\right)$
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