$x-y-2\:\left(x^2+2xy+y^2+2x-2y+4\right)$
$3+27x^3$
$16x^2+64x+64$
$23+8m+4n-5m-27$
$\lim_{x\to0}\left(\frac{-3sin\left(4x^8\right)}{-2x}\right)$
$\frac{12x^4y^5}{3x^6}$
$7x-21=4x$
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