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2a + 3l = 61 | 2a +3l = 61
-a + 4l = 19 |×2 --> -2a+8l = 38
---------- -
11l = 99 -> l = 9
-a + 4(9) = 19
-a + 36 = 19
-a = - 17
a = 17
aswan + lia = 17 + 9 = 26