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(x - 5) (x - 4)
x1 = 5 atau x2 = 4
x1 > x2
5 > 4 (memenuhi)
x1 + x2 + x1 + x2 = ...
5 + 4 + 5 +4 = 18.
kalo salah tolong beritahu. terimakasih.