$x^2\:4xy+4y^2$
$584-87.6$
$\sqrt{a}+\sqrt{b}=15$
$-+10+5by-5by+27+2b^2y$
$\frac{18x^5}{-6x^3}$
$\frac{4x-12}{x^2-9}=2$
$\lim\:_{x\to\:+\infty\:}\left(\frac{1}{x^n}\right)$
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