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2a-5
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2a+5
2a+5a+9a = 16a
9a +8 -2a -3 -5a = 2a +5
4a2 - 9a + 5 = 4a2 - 4a -5a + 5 = 4a(a - 1) - 5(a - 1) = (4a - 5)(a - 1)
9a + 1