$\frac{x^2+3}{x^3+x}$
$1^2-3^2+3$
$20x^2+7x=6$
$2\cdot3-5\cdot4$
$\frac{dy}{dx}=x+\left(y-x\right)\cdot\tan\left(x\right)$
$2x-3a\left(x-4a\right)$
$3x+2y+3x+2y+3x+2y+3x+2y$
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