$\left(49x^2-81\right)\left(-6x+x^2-91\right)$
$\left(m+r\right)^2$
$-\left(-cb^7\right)^3$
$\left(9-6x^3\right)\left(6x^3+9\right)\left(81+36x^4\right)$
$\left(x-y\right)-\left(2x+3y\right)$
$64w^2-48w+9$
$\left(a\:^6\:+\:7\right)\:\left(a\:^6\:+\:14\right)$
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