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u19= a + 18b = 74
-7b =-28
b = -28/-7 = 4
u12 = a + 11 (4) = 46
a = 46 - 44 = 2
s30 = 30/2 ( 2(2) + (29) 4)
15 (4+116)
15 ( 120)
1800