exam Maths Puzzle Numerical Ability

Can you please assist? I am not sure I am doing each step correctly. Thanks in advance!!

solve 2(x-4)=2[x-3(x-1)+2]

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exam Other Question

4^-x = 2^2x+3 could you please help me to solve this problem..it is from a question on a hand out.

find the inverse of f(x) = 3x+1 where f: R - R

i figured y=3x+1 y-1=3x and broke it down with an swer of x=y-1/3.

thanks for your help.