$\frac{3x^4+32x^2+45}{x+3}$
$ax^2+12x^4$
$5^{-6}\cdot5^9$
$\lim_{x\to0}\left(\frac{e^x-\left(1-x\right)}{x}\right)$
$\frac{-\sqrt{\frac{1}{2}}}{\left(\frac{1}{2}\right)}$
$28-\left[21-\:\left(12-3\:\right)-7\:\right]$
$1-\frac{2}{x}=\frac{15}{x^2}$
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