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a. 6a + 9 = 3
6a = -6
a = -1
b. gak tau :P
h(3) = a(3) + 9 = -6
3a = -6 - 9
3a = -15
a = -15/3
a = -5
A) h(6) = -5 (6) + 9 = -30 + 9 = -21
B) h(x) = -5x +9