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3a = -15
a = -5
a. h(6)=-5(6)+9 = -30 + 9 = -21
b. h(x) = -5x + 9
c. h(x)>0 (hasil postif)
-5x + 9 > 0
9 > 5x
9/5 > x
jadi domainnya x < 9/5