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4a - 9 = 27 4a = 36 a = 9
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
4a-2=7a-6 4=3a a=4/3
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3