(x*2)(x/3) = x*x-56


2x     x
--  * --  =  2x^2 / 3
1      3


EWW

2x^2     x^2(3 times)
----  - ----- + 56 = 0
 3        1

2x^2 - 3x^2
------------  +56 = 0
    3

-1x^2
-----  + 56 = 0
  3

3(-x^2+56) = 0

-3x+168 = 0  // -3

x+56 = 0