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p - 2q = 8 I kalokan 2I ⇒ 2p - 4q = 16
------------------------- -
7q = - 14
q = - 14/7
q = - 2
p - 2q = 8
p - 2 (- 2) = 8
p + 4 = 8
p = 8 - 4
p = 4