$-4\cdot76$
$81a^6-\:4b^2c^8$
$\left(-4\right)-\left(-4\right)-15$
$\lim_{x\to0}\left(\frac{1}{\frac{3}{ln\left(1+x\right)}-\frac{2}{x}}\right)$
$\frac{\frac{8x^3}{x-5}}{\frac{6x^2}{x^3-125}}$
$\lim_{x\to0}\left(\frac{x^3}{e^{x^2}}\right)$
$\frac{a^2-1}{2a}\cdot\frac{a}{a+1}$
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