$9m_{3g+5r_{4m+9g+2r\cdot}}$
$m\left(n+4\right)$
$3\log\left(x-1\right)-2\log\left(x^2-1\right)$
$1+\frac{7}{x+6}=\frac{7}{x^2+13x+42}$
$1pg^2+4pg^2$
$xy+4;\:x=7;\:y=10$
$\lim_{x\to0}\left(\frac{4-x^2}{3-\sqrt{x^2+5}}\right)$
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