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Qd = 15 - P
Qs = 7 + 3P
Qd = Qs
15 - P = 7 + 3P
-P - 3P = 7 - 15
- 4P = -8
P = -8/-4
P = 2
Qd = 15 - P
Q = 15 - 2
Q = 13