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f(g(x)) = 6x+11
f(2x+3) = 6x+11
f((2x+3-3)/2) = 6.((x-3)/2)+11
f(x) = 3.(x-3)+11
f(x) = 3x-9+11
f(x) = 3x+2
y = 3x+2
3x = y-2
x = (y-2)/3
f^-1(x) = (x-2)/3