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f(k) = 8 -2(k) = -10
= 8 -2x = -10
= -2x = -10 -8
= -2x = -18
= x = -18/-2
= x = 9
Itu jawabannya.
f(k) = -10
8-2k = -10
2k = 8+10
2k = 18
k = 9