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²log 7/2 = ²log (p - 3q)
p - 3q = 7/2 ... (1)
3p - 4q = 18 ... (2)
eliminasi:
3p - 9q = 21/2
3p - 4q = 18
__________ -
- 5q = 15/2
q = - 3/2
p = 7/2 - 9/2
= - 1