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F(X) = 3X-2
F(A) = 19
Jadi,
F(A) = 3A-2 = 19
F(A) = 3A = 19 + 2
F(A) = 3A = 21
F(A) = A= 21 ÷ 3 = 7
Pembuktian,
F(A) = 3A - 2
F(A) = 3.7 - 2 = 21 - 2 = 19
3x-2=19
3x=21
x=7
maka a = 7