Question 94109
=========={{{4r^2+6rs+9s^2}}}
================{{{2r-3s}}}
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==={{{-12r^2s-18rs^2-27s^3}}}
{{{8r^3+12r^2s+18rs^2}}}
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{{{8r^3}}}==========={{{-27s^3}}}
Ans={{{8r^3-27s^3}}}
Ed Jones