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a + 2b + a + 7b = 28
2a + 9b = 28 ------ 1
u12 = a + 11b
= a + 11b = 27 -------- 2
2a + 9b = 28
2a + 22b = 54 _
-13b = -26
b = 2
a = 27 - 22
= 5
u50 = 5 + 98
= 103