$2y-18+9y+7$
$2m^23mn-4m+6$
$\left(x+2y-3z\right)\left(5y-3x\right)$
$3lnx+5$
$-2n^3\cdot6n^2$
$\int\frac{2t^{2}-8t-8}{\left(t-2\right)\left(t^{2}+4\right)}dt$
$\int_{-\infty}^3\left(\frac{1}{x^2+9}\right)dx$
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