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=2(2b-1)-1
=4b-2-1
=4b-3
Semoga Membantu
2b-1 --> pengganti x
f(2b-1) = 2 (2b-1)-1
= 4b-2-1
= 4b - 3
jadi, f(2b-1) = 4b-3
maaf ya kalo salah, semoga membantu...