$\left(n-3\right)\left(n-4\right)$
$\left(7b^2-3\right)^2$
$\frac{\left(a\right)^{-2}}{a^{-4}b}$
$\int x^8e^{3x^9}dx$
$3+2\left(2b+4d\right)$
$108x^2y^2-40x^2y^2$
$49x^2+14x+1=0$
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