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a=-12
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2a/3=8+4a2a=3(8+4a) 2a=24+12a -10a=24 a=-24/10 a=-12/5
4a+5=25 4a=25-5 4a=20 a=20/4 a=5
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
12a