$12\cdot987$
$\frac{-90}{30}$
$3xy^221x$
$y^2-81y+1458$
$.07\cdot\frac{7}{12}$
$\left(x^3+\frac{1}{3x}\right)^4$
$\left(9d^5-b\right)\left(9d^5+b\right)$
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