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4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
4a - 5 = 7a - 7 -5 = 3a - 7 2 = 3a a = 3/2
10a + 3a - 4a = 9a
6-3a**2+7+4a-5a+18 3a**2-1a+31
The expression 4a - 5 - a + 2 can be simplified by combining like terms. Combining the terms with 'a', we get 4a - a = 3a. Combining the constants, we get -5 + 2 = -3. Therefore, the simplified expression is 3a - 3.