$25-5x=0$
$x^3+y^3=20$
$a^2+b^2=15$
$x^2-3x+13$
$\frac{1}{cos-jsin}$
$\left(3\sqrt{2}-3\sqrt{2}\right)$
$\int\frac{\left(16+x^2\right)}{x^2}dx$
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