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35= a + 4b
a = 35 - 4b
U9 = a + 8b
43 = a + 8b
43 = 35 - 4b + 8b
8 = 4b
2 = b
a = 35 - 8 = 27
U21 = a +20b
= 27 + 20 . 2
=27 +40
=67
dik: a = 5 - 1 = 4, 4×2 = 8 35 - 8 = 27
n = 21
b = 43 - 41 = 41 - 39 = 39 -37 = 37 - 35 = 2
U21 = 27 + (21 - 1)2
=67