$mx+nx+my+ny$
$\left(8x^2-2y^3\right)^2$
$-7+i\right)+\left(10-4i\right)$
$\frac{dy}{dx}\left(x^2+8y^2+7z^2=8\right)$
$\frac{1}{x+1}\le1+\frac{2}{x-1}$
$\frac{19^{11}}{19^8}=19$
$2 x ^ { 4 } - 12 x ^ { 3 } + 19 x ^ { 2 } - 6 x + 9$
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