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f(0) = 2(0) - 1 = 0 - 1 = -1
f(1) = 2(1) - 1 = 2 - 1 = 1
f(2) = 2(2) - 1 = 4 - 1 = 3
maka daerah hasilnya, HP:{-3,-1,1,3}