$9+5+\left(-2\right)-\left(-5\right)$
$\left(a^2\cdot8^7\right)^2$
$\left(x^4\right)dx+3x^2y^2dy=0$
$4a^4+3a^2b^2$
$\int_{-6}^{-1}\left(-\frac{2}{2x+1}\right)dx$
$\frac{2}{y^2-4}+\frac{3}{y^2-5y-6}+\frac{1}{y^2-y-6}$
$6^2+3-3^2$
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