Question 967300
Your description implies that width and breadth are the same direction.


x, length
y, breadth or width


x=y+5;


{{{xy=A}}};
{{{(x+2)(y+2)-xy=50}}}
{{{xy+2x+2y-4-xy=50}}}
{{{2x+2y-4=50}}}
substitute now for x from the described relation with y.
{{{2(y+5)+2y-4=50}}}
...


Should be clear enough, no expected difficulty to finish.