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Nomor 6
bagian A
f(-3) = -3(-3) + 6
------> 9 + 6
------> 15
f(2) = -3(2) + 6
f(2) = 0
bagian B
f(a) = -3a + 6
-9 = - 3a + 6
-9 - 6 = -3a
-15 = -3a ----------> a = 5