$-9x-6x-2x$
$10m^2n-15mn^2+20mn$
$5x^2+26x+5=0$
$-10x^2+7x+25\ge0$
$m+7\ge12$
$x^2=1-4x$
$\lim_{x\to11}\left(\frac{1-\cos2x}{1-senx}\right)$
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