$\left(10-57\right)-\left(45-57\right)$
$\int\frac{x-4}{x^2-49}dx$
$5x^2+2x+25$
$\left(9-2x\right)^5$
$\int\frac{8x^2+12x-15}{x^4}dx$
$230\::\:-10$
$\int\left(\frac{1}{\left(3x-7\right)^2}\right)dx$
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