$\left(-30\right)\left(-2\right)\left(-1\right)\left(-4\right)$
$\left(2zs^6\right)^3$
$9y^2-90yz+225z^2$
$-16\:.\:-1$
$87j+21k-12j+23j-8k$
$9x^2+50x-18$
$\left(-19\right)\:\left(-80\right)$
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