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U5 = U1 + 4b = 31
-
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-2b =-14
b = -14/-2
b = 7
U3 = U1 + 2b
17 = U1 + 2.7
U1 = 17-14
U1 = 3
jadi , U20 = U1 + 19b
= 3 + 19.7
= 3 + 133
U20= 136