3(m^2 + n^2 - 3mnr + r^2) - [5(2m^2 + n^2 - 2mn) - {-r^3 + 3(m-2) + 8mn^2}]
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3m²+3n²-9mnr+3r²-10m²-5n²+10mn+r³-3m+6-8mn²
r³-7m²-2n²+3r²-8mn²+10mn-9mnr
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