Question 991265
{{{ (xy^-6z^-1/x^4y^8z^-3)^-3}}}
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It's not important what you do first.
I'll apply the overall -3 exponent.
= {{{ (x^-3y^18z^3/x^-12y^-24z^9)}}}
Multiply NUM and DEN by x^12
= {{{ (x^9y^18z^3/y^-24z^9)}}}
Multiply NUM and DEN by y^24
= {{{ (x^9y^42z^3/z^9)}}}
Multiply NUM and DEN by z^-3
= {{{ (x^9y^42/z^6)}}}