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daerah bayangan = 53, berarti f(x) = 53
f(x) = 2x - 1
f(x) = 53
2x - 1 = 53
2x = 53 + 1
2x = 54
x = 54 : 2
x = 27
jadi, daerah asalnya (nilai x) adalah 27
2x=53+1
2x=54
x=54/2=27