Equation with double absolute value I have problem with solving the following equation.
$$2x - |5-|x-2|| = 1$$
How to handle absolute value in absolute value?
I have tried multiple times to solve it but I get no solution.

No "easy way out". Solve the first absolute value $$|x-2|=\begin{cases}-x+2, & x<2\\\phantom{-}x-2, & x\ge 2 \end{cases}$$ to take cases


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*Case 1: $x<2$. Then $$2x-|5-|x-2||=2x-|5-(-x+2)|=2x-|x+3|$$ And now take subcases (but do not forget that you are in $x<2$) depending on the second absolute value 
$$|x+3|=\begin{cases}-x-3, & \hspace{26.5pt}x<-3\\ \phantom{-}x+3, & -3\le x <2  \\\end{cases}$$ So, $$2x-|x+3|=\begin{cases}2x-(-x-3)=3x+3, & \hspace{26.5pt}x<-3 \\2x-(x+3)=x-3, & -3\le x < 2 \end{cases}$$ And now treat each subcase separately: $$3x+3=1\iff x=-\frac23\not <-3$$ so, no solution here. Second subcase:  $$x-3=1\iff x=4 \notin-3\le x<2$$ so, nothing here either. 

*Case 2: $x\ge 2$. Then $$2x-|5-|x-2||=2x-|5-(x-2)|=2x-|7-x|$$ And now take subcases (but do not forget that you are in $x\ge 2$) depending on the second absolute value 
$$|7-x|=\begin{cases} \phantom{-}7-x, & 2\le x<7\\-7+x, & 7\le x  \end{cases}$$ So, $$2x-|7-x|=\begin{cases}2x-(7-x)=3x-7, & 2\le x<7 \\2x-(-7+x)=x+7, & 7\le x \end{cases}$$ And now treat each subcase separately: $$3x-7=1\iff x=\frac83\approx2.67\in [2,7)$$ so, bingo! first solution here. Second subcase:  $$x+7=1\iff x=-6 \not \ge 7$$ so, nothing here.


The only solution is $x_0=\frac83=2\frac23$.
