Answer
$-6ab^2z^3-6ab^3z^2+18b^3z$
Work Step by Step
$-6b^2z(z^2a+baz-3b)\longrightarrow$ Apply distributive property.
$(-6b^2z)(z^2a+)+(-6b^2z)(baz)-(-6b^2z)(3b)$
$-6ab^2z^3-6ab^3z^2+18b^3z$
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