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f(-3) = 9 + 6 = 15. (Jadi, 15 adalah bayang-bayang -3)
f(2) = -3.2 + 6
f(2) = -6 + 6 = 0. (Jadi, 0 adalah bayang-bayang 2)
b.f(a) = -3a + 6
f(a) = -3.5 + 6
f(a) = -15 + 6 = -9.
Jadi, a adalah 5.