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b) f(-3)=6-3a=6-3(-3)=6+9=15
c) f (3)=6-3a=6-3(3)=6-9=-3
d) f(7)=6-3a=6-3(7)=6-21=-15
f(a) = 6 - 3a
6-3a = -15
6 + 15 = 3a
3a = 21
a = 7
Opsi D