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f(x) =-6 - 5
f(x) =-11
f(x)=2(-2) - 5
f(x)=-4 - 5
f(x)=-9
f(x)=2(-1) - 5
f(x)=-2 - 5
f(x)=-7
range={-7,-9,-11}
f(-2)=-9
f(-1)=-7
daerah hasil = (-11,-9,-7)