Find the value of x.

6*{[35-(4+x)]*4}=600 

6* [ (35 - 4 - x) * 4 ] = 600

6* [ (31 - x) * 4  ]  = 600

6* [ 124 - 4x]  = 600

744 - 24x  = 600     rearrange as

744 - 600  = 24x

144  = 24x    divide both sides by 24

6  = x