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30a^{2}-42ab+45ba-63b^{2}
Apply the distributive property by multiplying each term of 6a+9b by each term of 5a-7b.
30a^{2}+3ab-63b^{2}
Combine -42ab and 45ba to get 3ab.
30a^{2}-42ab+45ba-63b^{2}
Apply the distributive property by multiplying each term of 6a+9b by each term of 5a-7b.
30a^{2}+3ab-63b^{2}
Combine -42ab and 45ba to get 3ab.