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= 9 + 6= 15
f(2) = -3.2
= -6
f(x) = -3x+6
f(a) = -3x+6
-9 = -3.a + 6
-9-6 = -3a
-15÷3 = a
a = -3
f(-3) = -3(-3) + 6
= 9+6=15
f(2) = -3(2)+6=0
b.f(a)=-9
f(a)= -3(a)+6=-9
= -3a+6=-9
=-3a=-9-6
a=-15/-3= 5