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f(c) = -1
di f(x) , x nya diganti aja sama c
Jadi
f(c) = 4c + 7 = -1
= 4c = -1 -7
= 4c = -8
= c = -2
Jawabannya A
4c = -1-7
4c = -8
c = -8:4
c = -2 (A)