$m^2+3m=4$
$\frac{2x^2}{2x^2-4x+3}$
$3x+x^2-9x^{-5}+8x\frac{2}{3}$
$\tan x^2-\cot x^2$
$\left(\frac{1}{4}x+\frac{2}{5}y\right)^2$
$\lim_{x\to3}\frac{\sqrt{x+1}}{x-4}$
$-24^2-1$
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