Area of a rectangle=length x width
In this case:
Area of this rectangle=70 u²
lenght=x+4
width=7
We can suggest the next equation:
7(x+4)=70
We solve the equation:
7(x+4)=70
7x+28=70
7x=70-28
7x=42
x=42/7
x=6
length=x+4=6+4=10
Answer: the equation would be : 7(x+4)=70; and the length would be 10u.
