$\left(7x^2+3x+9\right)+\left(5x^2-x+6\right)$
$\lim_{x\to\infty}\left(3^{x+1}\right)$
$\sqrt{x^2-3x-x}$
$3x^2yz+4x^2yz-\frac{1}{2}x^2yz-\frac{1}{5}x^2yz+2x^2$
$6y''-y'+y=0$
$\frac{1}{x-4}=\frac{3}{x}$
$1,2x-1,8x$
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