$-2+\left(-3\right)-\left(+5\right)+2-8$
$3x+9=4x-2$
$9x^2+60^3y^4+100$
$\lim_{x\to0}\left(\frac{5^x-15^x}{x}\right)$
$\frac{x^{15}+y^{15}}{x^{5}}$
$\frac{1.3}{585}$
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