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Maka:
-2k + 6 = -12
-2k = -12 - 6
-2k = -18
Kalikan -1
2k = 18
k = 18/2
k = 9
f(k) = -2(k) +6 = -12
= -2k +6 = -12
= -2k = -12 -6
= -2k = -18
= k = -18/-2
= k = 9
Jadi, nilai k adalah 9.