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f(3)=3a+b=9
3a+b=-15
3a+b=9 lalu ditambah
2b=-6
b=-3
3a+b=9
3a=12
a=4
f(×)=4x-3
f(-2)=4(-2)-3
=-11
f(2)=4(2)-3
=5
hasilnya -6