$12-\left\{-5-6+\left\{-3+2\left\{-4+5\right\}-7+9\right\}\right\}-15+25$
$\left(3x+y\right)\left(3x^2-y^2\right)$
$37b^2\left(33b^2\right)$
$\frac{2x^3-x^2-9x+4}{x-2}$
$\left(p^{-8}q^6\right)^0$
$\int\left(2\cos^5x\right)dx$
$-7-7-7-+5$
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