$x^2+6xy+5x^2$
$5^5\cdot2^4\cdot2^2$
$\left(a^4-b^4-a^4b^4\right)\left(-ab\right)$
$5^3\cdot5^5$
$x-2=4$
$\lim\:_{x\to\:4\:}\left(\frac{3\sqrt{x}-x}{3-\sqrt{x}}\right)$
$\lim_{x\to5}\left(x^3-4x+8\right)$
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