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f(a) = 7
f (a) = 3.a - 2 = 7
3a = 7 + 2
3a = 9
a = 3
bukti : a = 3
masukkan ke :
f(a) = 7
diganti f(3) = 7
f(3) = 3.a - 2
3.3 - 2 = 7
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=> 3a - 2 = 7
3a = 7 + 2
a = 9/3
a = 3