a rectangle has one side equal to (2x+4)cm and a perimeter of (6x+4)cm what is the area of rectangle in terms of x

For convenience let's call the given side the length, so...
 
W are also given the perimeter...6x+4 and we for a rectangle, 
therefore: 

so we have enough information to solve for w: 

 
Now we have enough information to solve for area.

so