Answer:
6x + 8y = 13. 8y = 13 - 6x.
y = (13 - 6x) / 8.
f(x) = (13 - 6x) / 8.
x = (13 - 6f-1(x)) / 8.
8x = 13 - 6f-1(x).
6f-1(x) + 8x = 13 S
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