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-6 = 3a + 9
-15 = 3a
a = -5
h(x) = ax + 9
h(x) = -5x + 9
h(6) = -5.6 + 9
h(6) = -21
0 = -5.x + 9
-9 = -5x
x = 9/5
Untuk hasil positif, x>9/5