Question 264587
2L+2W=P
2(X+4)+2*2(X+4)=56
2X+8+4X+16=56
6X=56-16-8
6X=32
X=32/6
X=16/3 
16/3+4=(16+4*3)/3=(16+12)/3=28/3 ANS. FOR ONE SIDE. 
2*28/3=56/3 ANS. FOR THE OTHER SIDE.
PROOF:
2*28/3+2*56/3=56
56/3+112/3=56
168/3=56
56=56