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g(x)= 3x + 1
h(x)= fog (x)
h⁻¹(x)= {fog(x)}⁻¹
h(x)= f(g(x)) = f(3x+1)
h(x)= {2(3x+1) + 3 } / {3x+1 -5}
h(x) = (6x+2+3)/(3x+1-5)
h(x) = (6x + 5)/(3x -4)
h⁻¹(x)= (4x + 5)/(3x - 6)