Question 17297
To solve the problem, you will first need to substitute 3w for L and 2w for h.  This will make your equation {{{2(3w)+2w+2w=72}}}.  Now, multiply 2 and 3w to make the equation {{{6w+2w+2w=72}}}.  Then combine like terms to get {{{10w=72}}}.  Solve for w to get {{{w = 7.2}}}.


To get L, plug 7.2 in for w to make that equation {{{L=3(7.2)}}}, which makes {{{L=21.6}}}.


To get h, plug 7.2 in for w to make that equation {{{w=2(7.2)}}}, which makes {{{w=14.4}}}.