$5x+15>10x-50$
$a+b=4$
$-mn+14mn-31mn-mn+20mn-15mn+28mn$
$x^{4-16}$
$3y+y'=6\cdot\left(1+\frac{x}{2}\right)$
$\lim_{x\to2}\left(\frac{x^3-8}{x-7}\right)$
$2\cdot\left(-3+5\right)+2\cdot\left(2-10\right)+\left(4-6\right)$
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