$\left(8-n^7\right)\left(8+n^7\right)$
$\left(\frac{7}{8a^2}+\frac{3b}{4}\right)$
$64-3|3-7\left(9-2\right)|$
$\frac{\left(6x^4+2x^3+4x^2+3x+8\right)}{\left(-2+8x\right)}$
$\frac{2k-3}{x-1}+\frac{3kx-2}{x+1}=2k+3$
$18x^2-9x+1$
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