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-42=5x+q
7 =-2x+q
__________ _
p(-2)+q=7 ->-2p+q=7
dikurangi
7p=-49 p=-7
-2p+q=7
-2.-7+q=7 q=-7
p(12)+q=
-7(12)+-7
-84+-7= -91
jadi nilai f(12) adalah -91