$93\:-\left(-10\right)$
$\lim_{x\to0}\left(\frac{3x^2-4x-11}{2x+1}\right)$
$1-25y^2$
$x^2-14x-1=0$
$\left(15x^3y^2-8x^2y^3\right)dx\:+\left(12x^4y-10x^3y^2\right)dy\:=0$
$\tan^2x-6\tan x=4$
$11x+4<4x+2$
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