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x = 4
f(x) = 1
x - 1 = 1
x = 2
f(x) = -1
x - 1 = -1
x = 0
yg memenuhi: 0,2,4
2x-x=3+1
x=4
x-1=1
x=2
x-1=-1
x=0
jawabannya adalah D (0.2,4)