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F(2)=-3(2)+6=0
b.f(a)=-9
-3a+6=-9
-3a=9-6
-3a=3
a=3/-3
a=-1
f(2)= -3(2)+6=-6+6= 0
-3x+6=-9
-3x=-9-6
-3x=-15
x=-15/-3=5