$\frac{10}{7}x^5-\frac{1}{63}x^5+\frac{1}{9}x^2+\frac{1}{8}x^2$
$\left(e^{\left(5x\right)}\right)^2$
$12n^3+4n^{2+3n+1}$
$-5\left(-2k\:-\:9\right)$
$\pi+\pi$
$4-3x\le-1-8x$
$\frac{9-x^2}{3-x^2}$
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