You would take the 36 and divide it by the 3 then add 6
The first equation is 
(Equation 1)
The second equation is
(Equation 2)
Putting the value of x from equation 1 in equation 2.
we get,


by simplifying the given equation,


Using discriminant formula,


Now the formula for solution 'x' of quadratic equation is given by:


Hence, these are the required solutions.
7 yd > 1 ft, 25 ft > 38 in. idk about that 3 ft there
The correct answer is -78.15 m.
Hope this helped! :)