$\frac{8^7}{8^5}$
$\left(x-6y\right)\left(x+6y\right)$
$-81x^4+9$
$144a^2-168a+49$
$\left(2x+1\right)\left(y-z-1\right)$
$8x-5\ge67$
$\left(w^2\right)^7$
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