https://www.ato.gov.au/General/Capit...-you-move-out/

example towards the bottom explains fairly well when you look at the calculations.

seems for you it would go

1/10 years living
9/10 years no living in, minus 6 years under main residence exemption (not sure if support required)

leaving 3 years not exempt from CGT.

CGT apportioned over total life of ownership = CGT payable on 30% of total profit is my guess