$7+5+3\cdot3$
$-2.2+3$
$\int\left(x^2-5\right)^9\cdot x^2$
$\sqrt{2x-5=5}$
$\frac{-14}{\tan^2x}$
$2\left(n+3\right)$
$2x-3x^{2}+2xy$
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