Please assist with steps to arrive at above function composition and inverse functions answer thanks

Please assist with steps to arrive at above function composition and inverse functions answer thanks

a) 2+3x−1 =18 b) ln(x2 −4)=8 c) log3(x−2)+log3(x+1)=6

I have tried to solve this problem for hours and can't figure it out.

How to solve problem

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