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2. 5a -6 +ab -a -2ab +1 = 4a -ab -5
2x + 5 - x + 3
2x - x + 5 + 3
x + 8
2. (5a - 6 + ab) - (a + 2ab - 1)
5a - 6 + ab - a - 2ab + 1
5a - a - 6 + 1 + ab - 2ab
4a - 5 - ab