Question

||8х+1|-2|=9
|4+|5х+2||=9
||10х+7|-5|=13

Answer 1

1. $||8x+1|-2|=9\|8x+1|-2=9\|8x+1|-2=-9\x_1=frac{-3}{2}; x_2=frac{5}{4}$  
2. $|4+|5x+2||=9\|5x+2|=5\5x+2=5; 5x+2=-5\x_1=frac{-7}{5} ;x_2=frac{3}{5}$  
3. $||10x+7|-5|=13\|10x+7|-5=13; |10x+7|-5=-13\x_1=-frac{5}{2}; x_2=frac{11}{10}$