$r^2-9$
$\left(\frac{4}{7}x+1\right)^2$
$( m + 2 ) ^ { 3 } ( m - 2 ) ^ { 3 }$
$\left(x^2-x-1\right)\left(2x\right)$
$\left(3a^3+b^3c\right)^2$
$-604\:+\:-775\:$
$4a^2-a^2$
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