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3x-2=2
3x=4
x=4/3
F(x) = 0
3x-2=0
3x=2
x=2/3
3x-2=1
3x=3
x=1
maka domainnya {4/3, 2/3, 1}
-f(2)=3(2)-2
=6-2
=4
-f(0)=3(0)-2
=0-2
=-2
f(-1)=3(-1)-2
=-3-2
=-5
{-5,-2,4}