Question 469069
Let x cm is the width of a rectagular mailing label 
The length of a rectagular mailing label is 4 centimeters less than twice the width, then the length is {{{2x-4}}} cm
The perimeter of a rectangle is {{{P=2(l+w)}}}, where l is the length, w is the width
Equation {{{2(x+2x-4)=52}}}divide by 2
{{{3x-4=26}}}
{{{3x=26+4}}}
{{{3x=30}}}
{{{x=30/3}}}
{{{x=10}}}cm is the width of a rectagular mailing label 
The length is {{{2*10-4=16}}}cm