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f(3x + 1) = 2(3x + 1) -1
ganti 3x + 1 menjadi 5t
f(5t) = 2(5t) - 1
f(5t) = 10t - 1
1 = 10t - 1
1 + 1 = 10t
2 = 10t
t = 2/10
t = 0,2