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Verified answer
Qd = 21 - 3PPd = -1/3 Q + 7
Penawaran (25,4) (30,5)
a = (5 - 4)/(30 - 25) = 1/5
b = 5 - 1/5 (30) = -1
Ps = 1/5 Q - 1
↓
Syarat keseimbangan pasar
Pd = Ps
-1/3 Q + 7 = 1/5 Q - 1
-------------------------------- ×15
-5Q + 105 = 3Q - 15
8Q = 120
Q = 15
P = -1/3 (15) + 7
P = 2
Maka titik keseimbangan pasar
(Q,P)
(15,2)