$\left(2.9\right)\cdot\left(-30.6\right)$
$\pi\left(x-2\right)\left(x-1\right)$
$2\cdot\left(-3\right)-\left(-3\right)^2$
$x+4=16$
$\left(-69\right)-\left(-87\right)$
$\left(1+x^2\right)\left(x^6-12x^4+60x^2\right)$
$\left(5x^3y^{-2}z\right)\left(2xyz^{-3}\right)$
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