$12abc-5-12abc+8$
$\left(8mn+9n\right)^2$
$4x^4y^4-16x+16$
$\frac{1-x^5}{1-x}$
$\left(a+\left(b+2\right)\right)\left(a-\left(b+2\right)\right)$
$\left(\frac{m-7}{m-2}\right)^3$
$6+-8\cdot11+8$
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