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u2 - u1 = u3 - u2
6a + b - ( 2a +b) = 14a +b - ( 6a +b)
6a + b - 2a - b = 14a + b - 6a - b
4a = 8a
agar sama maka a = 0... c
U2-U1 = U3-U2
(6a + b) - ( 2a +b) = (14a +b) - ( 6a +b)
6a + b - 2a - b = 14a + b - 6a - b
6a - 2a = 14a - 6a
4a = 8a
8a-4a = 0
4a = 0
a = 0/4
a = 0
jawaban C