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g(f(x)) = 6-8x+5 = -8x+11
(gof)^-1 (x) = y
y = -8x+11
-8x = y-11
x = (11-y)/8
(gof)^-1 (x) = (11-x)/8
(gof)^-1 (3) = (11-3)/8 = 8/8 = 1