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p1 = 100.
p2 = 50
Q1 = 650
Q2 = 550
Qs = p - p1. Q-Q1
--------- = -----------
P2 - P1. Q2 - Q1
Qs = p - 100. Q - 650
--------- = -----------
50 - 100. 550 - 650
Qs = p - 100. Q - 650
--------- = -----------
-50. -100
-50 (Q - 650) = -100 (P - 100)
-50Q + 32.500 = -100P + 10.000
-50Q = -100p + 10.000 - 32.500
-50Q = -100p - 22.500
---------------------------------: -50
Qs = 2P + 450
Qd = Qs
600-P = 2P + 450
-P - 2P = 450 - 600
-3P = -150
P = 50
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