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f(-3)=6(-3)+9
=-18+9
=-9(a=-9)
f(x)=6x+9
=6x+9=-3
=6x=-3-9
=6x=-12
=x=-12/6
=x=-2(b=-2)
a+b=
-9+(-2)
-9-2=-11
2.f(x)=5x-4
f(a+2)=5(a+2)-4=16
=5a+10-4=16
=5a+6=16
=5a=16-6
=5a=10
=a=10/5
=a=2
maaf cuma ini yang saya tahu
maaf kalau ada kesalahan atau kurang jelas