$70+18-10-15$
$3a+\left[2a-\left(a+b\right)\right]$
$\lim_{x\to3}\left(2x-5\right)^{\frac{7}{x-3}}$
$\frac{x^4}{x^4}$
$\frac{x^{12}-y^{12}}{x^3-y^3}$
$m^5-12m^2+6m$
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