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Verified answer
Fungsi Komposisif(g(x))
= 6(5x+4) - 3
= 30x + 24- 3
= 30x + 21
f(g(a)) =81
30a + 21 = 81
30a =60
a = 2
(fog)(a)=81
30a+21=81
30a=81-21
30a=60
a=60/30
a=2
jadi nilai a adalalah 2