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g(x) = ax + 7
g(-2) → a (-2) + 7 = 1
-2a + 7 = 1
-2a = 1 -7
-2a = -6
a = 3
lalu masukkan nilai a ke persamaan yang baru
g(5) = ax + 7
= 3 x 5 + 7
= 15 + 7 = 22