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f (k) = -15
f (k) = 2x-5= -15
2k = -15+5
2k = -10
k = -10/2
k = -5
f(k) = 2k - 5 = -15
Penyelesaian
2k - 5 = -15
2k = -15 + 5
2k = -10
k = -10/2
k = -5