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e. 5m²-2y²+xy+19
f. 19-m-2a+7k-2b
e. (3m²+2m²) + (3y²-5y²) -5xy +6xz+19
= 5m²-2y²-5xy+6xz+19
f. (-7m+6m) + (9+10) + 7k - 2b -2a
= -m+19+7k-2b-2a