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9a + 1
2a+5a+9a = 16a
4a2 - 9a + 5 = 4a2 - 4a -5a + 5 = 4a(a - 1) - 5(a - 1) = (4a - 5)(a - 1)
The simplified expression is -9a -9b.
There is nothing you can do to 9a + 5 without knowing the value of a.