Question 271527
To get the perimeter you add both lengths and both widths. Which is also seen as: {{{2l+2w=146}}}

Now plug in the length for l, and the width for w: {{{2(49)+2(2x)=146}}}

Now you need to mulitply to get rid of the parenthesis: {{{98+4x=146}}}

Subtract 98 from both sides: {{{4x=48}}}

Divide by 4 on both sides: {{{x=12}}}