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g(7x + 2) = 21x + 2
y = 7x + 2
7x = y - 2
x = (y - 2) / 7
g(x) = 21((y - 2) / 7) + 2
= 3(y - 2) + 2
= 3y - 6 + 2
= 3y - 4
peubah y diganti ke x
maka g(x) = 3x - 4