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f(-3) = -3(-3) + 6
= 9 + 6 = 15
f(2) = -3(2) + 6
= (-6) + 6 = 0
b) f(a) = -9
(-9) = (-3)a + 6
-9 = -3a + 6
3a = 6 + 9
3a = 15
a = 5