f(x) = b-8x f(b) = -42
F(b) = b-8x
-42 = b-8x
-42+8 = b
b = -34
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f(x) = b-8x f(b) = -42
F(b) = b-8x
-42 = b-8x
-42+8 = b
b = -34
b - 8b = -42
7b = 42
b = 42/7
b = 6
jawabannya adalah 6