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U14 = 77
U20 =?
(di eliminasi)
a + 13b = 77
a + 6b = 42
(dikurangkan)
= 7b = 35
b = 35/7
b = 5
(pilih salah satu persamaan)
a + 6(5) = 42
a + 30 = 42
a = 42-30
a = 12
U20 = a + 19b
12 + 19(5)
12 + 95
107