-1
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9=4a+13 9-13=4a -4=4a -4/4=a -1=a a=-1
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14
11a + 9 = 4a + 30Subtract 9 from both sides to get: 11a = 4a + 21Subtract 4a from both sides to get:7a = 21Divide both sides by 7 to get:a = 3And there's your answer: a = 3
4
9+9+9+9 = 36