subtract 5a³+4a²b+7ab from 4a²b+5ab+9
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= 5a^3 + 4a^2b + 7ab - (4a^2b+5ab+9)
= 5a^3 + 4a^2b + 7ab - 4a^2b- 5ab - 9
=5a^3 + (4a^2b-4a^2b) + (7ab -5ab) - 9
= 5a^3 + (0) + (2ab) - 9
= 5a^3 + 2ab - 9
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