$7x=49$
$\sqrt{x^7}.\sqrt{x}$
$5-3-1$
$\int\:\frac{x^2+x-4}{x^2-x-2}dx$
$z^7-128$
$9c+11-9+6c-10c+8$
$\lim_{x\to\frac{1}{2}}\left(2x+\frac{1}{4x^2-2x}\right)$
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