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B.f(-3)=4-3(-3)
=4+9
=13
f(1)=4-3(1)
=4-3
=1
f(8)=4-3(8)
=4-24
=-20
C.f(a)=4-3(a)
5 =4-3a
3a=5+4
3a=9
a=9:3
a=3