$8x+21-x=7\left(x+3\right)$
$2x^5+9x^4+9x^3-x^2-3x$
$a^2-169$
$-\frac{725}{5}$
$\frac{1}{x^2}+\frac{2}{x^2}$
$x^2\:-\:\:\frac{3}{2}x\:-\:\frac{1}{2}$
$\int\left(x^p\right)\ln\left(x\right)dx$
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