$\frac{x+3}{6x^2+3}$
$2x+\frac{x+\frac{1}{2}x}{\frac{3}{2}x}$
$2^3+5x^2-6x+7$
$( 9 x ^ { 2 } - 49 x ) ^ { 2 }$
$-114-78$
$\lim_{x\to1}\left(\frac{x^2\:-1}{x^2\:-1}\right)$
$\left(2x+4\right)dx-\left(3y-1\right)dy=0$
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