$\lim_{x\to\infty}\left(\sqrt{x-\sqrt{x}}-\sqrt{x+\sqrt{x}}\right)$
$\frac{3}{2}x+4$
$\frac{8x^2+4x\:-7}{x^2}$
$-36=18$
$x^2+18x+4=0$
$7n+-6n+-10n+8n+-5n$
$\frac{7x^3y^{16}z^9}{2x^2y^7}$
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