$-6x\cdot2x^3$
$8^{-3}\cdot8^4$
$-\frac{10^8}{10^{12}}$
$x^{2+18x+9}$
$\left(\frac{1}{7}\right)^{-1}$
$\lim_{x\to0}\left(\frac{\left(1-cos6x\right)}{1-cos3x}\right)$
$a+\frac{1}{2}a+\frac{2}{3}a$
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