$\int\frac{5x-7}{x^2-2x+5}dx$
$45\cdot9$
$\left(8p-3d^3\right)^2$
$4350-2900-800-500$
$2senx-\frac{1}{senx}=1$
$4xy^2+2x^3y-5x^3y-9xy^2$
$-9-\left(-10+\left(15-25\right)\right)$
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