$\int\frac{7+x}{7x+\frac{1}{2}x^2}dx$
$36-81x^2$
$5^6\cdot5^3\cdot5^4$
$\int\ln\left(5x+1\right)dx$
$57^2-53^2$
$33x^2-x-2=0$
$\frac{x^5}{x^3-1}$
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