$\:\left(2a^4b^7\right)\left(4a^2b^3\right)$
$-10:-5+3-4-9$
$\frac{dy}{dx}+5y=x^2$
$\lim_{x\to-\sqrt{5}}\left(\frac{x^2+2\sqrt{5}x-15}{x+\sqrt{5}}\right)$
$-c+5d+7c-11d+d-3c$
$2x+11\le45$
$\frac { ( 1 - x ) ^ { 3 } } { x ^ { 3 } }$
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