$681,12-85,007$
$3a^4\cdot2a$
$a^6-4a^3+4$
$6a-\left(-a\right)+\left(-9a^2\right)$
$\left(9a^2+6ab+4ab^2\right)\cdot\left(3a-2b\right)$
$x\left(2\right)+18x+81$
$\left(2x-7\right)\left(x-7\right)$
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