$\frac{x-7}{3x^2-21x}$
$\int\left(arctan\left(\frac{1}{\sqrt{x}}\right)\right)dx$
$x=20-y$
$16x^2+678x-769=0$
$y^'=8\sin7x$
$\left(-3+8\right)-\left(2-5\right)$
$-b^2+b^2$
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