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Cb = 0, Cd = 100, 100 satuan
Yx = Cx = Z
Yx - Yb / Yd - Yb = Cx - Cb / Cd - Cb
Yx - 20 / 140 = Cx / 100
100(Yx - 20) = 140Cx
100Z - 2000 = 140 Z
40 Z = -2000
Z = 50