$x^2-\frac{9}{16}=0$
$\left(-7a^2+2\right)\left(7a^2-2\right)$
$\frac{4a^2b^4-64c^8}{2ab^2+8c^4}$
$\left(4a^2+9\right)^3$
$4^3\:\cdot16$
$7m-3m+2$
$8n^2+8n$
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