$x-\left(x+3\right)^2=-5$
$9x-\frac{1}{3\sqrt{x}}^{18}$
$5\tan x-4\tan^2x=1$
$x^2-\frac{1}{5}x+x$
$-12\cdot\frac{3}{4}$
$\frac{x}{2}-3\ge-7$
$\int\frac{4}{x^{2\:}-81}dx$
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