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= 9/3
= 3
U5 = a + 4b
14 = a + 4 . 3
14 = a + 12
a = 2
U30 = a + 29b
= 2 + 29 . 3
= 2 + 87
= 89
a+(8-1)b=23 -
a+(5-1)b=14
3b=9
b=3
a=2
2+(30-1)3= 89