a + b - 2 is the answer in simplest terms. without telling us what a or b is this is the most accurate answer.
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It is 6a + 4
4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
7a minus 2, if "3a-2" means 3a minus 2. 3a plus 1 and 1-3rd in parenthesis times 3a, if "3a-2" means 3a squared. a plus 3a squared plus 3a = 1-3rd times 3a plus 3a times 3a plus 1 times 3a = 3a plus 1 and 1-3rd in parenthesis times 3a
3(a+4) = 3a+12
(5a+8) - (2a+4) =3a +4 To do this, simply subtract like terms. 5a-2a=3a and 8-4=4