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A = B - 4000 A = x - 4000....(1)
A + B ≤ 50000
A + x ≤ 50000....(2),
maka substitusi persamaan 1 ke pers. 2
A + x ≤ 50000
(x - 4000) + x ≤ 50000
2x - 4000 ≤ 50000
2x ≤ 54.000
x ≤ 27.000 ini model mtknya