$12-28x+\frac{15}{6x-5}$
$x^2-5x^2+x+12$
$1+2-3n-4$
$\lim_{x\to\infty}\left(n^2sin^2\left(\frac{1}{n}\right)\right)$
$\sqrt{100}+\sqrt{81}$
$1-\frac{1}{-1}$
$2a\left(4+a^2\right)$
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