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jika g(x) = 4x+1
maka
2(x) + n = 8x + 1
8x+2 + n = 8x+1
n = 1 - 2
n = -1
maka f(x) = 2x - 1
y = 2x-1
y+1 /2 = x
f¹(x) = x+1/2
f¹(-7) = -7+1/2 = -3