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(P-P1) / (P2-P1) = (Q-Q1) / (Q2-Q1)
(P-3) / (4-3) = (Q-6) / (10-6)
(P-3) / (1) = (Q-6) / (4)
4(P-3) = 1(Q-6)
4P-12 = Q-6
-Q = -4P+12-6
-Q = -4P+6
Q = 4P-6
*harga keseimbangan
Qd = Qs
15-3P = 4P-6
-3P-4P = -6-15
-7P = -21
P = 3
Jadi harga keseimbangannya adalah Rp. 3
Semoga membantu