$13r+25-8r+14g+5g$
$\left(a-2b+2c\right)^2$
$\int_3^{10}\frac{2}{x}-\frac{2}{x-1}+\frac{2x+4}{x^2+4}dx$
$\frac{2}{3\left(2x-1\right)}+\frac{7}{6\left(x+1\right)}-\frac{1}{2\left(x-1\right)}$
$x=\tan\left(66\right)\cdot25$
$\left(8x^2y^7z^8\right)\left(5x^9y^6\right)$
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