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The simplified expression is -9a -9b.
13
It is the same as: 9a -4a = 5a
It is: 9a-a-a = 7a
2a + 3 - 9b - a - 7 Bring like terms together: = 2a - a - 9b + 3 - 7 Combine like terms: = a - 9b - 4