Question 982065
Not enough information to know those two variables.


The expression for your area, {{{x+5x+6}}}
{{{6x+6}}}


You expect some dimensions w and L so that {{{wL=6x+6}}}.  The three variables could be anything that makes the equation true using positive real numbers.


One way is factorize the area:
{{{6(x+1)}}}


One dimension could be 6 and the other dimension x+1.