Duh I forgot to add the unknown quantity into my equation ROFL!!
4 + [( 6 - 9 ) + (8 + 9)] = 15 - [2 + ( 3 - 6 + 8 ) + 2] + x
There that should be solveable.
If you don't ignore parenthesis
4 + [( 6 - 9 ) + (8 + 9)] = 15 - [2 + ( 3 - 6 + 8 ) + 2] + x
4 + [-3+17] = 15 - [2 + 5 + 2] + x
4 + 14 = 15 - 9 + x
18 = 6 + x
18 - 6 = x
12 = x
However, if you do ignore parenthesis (which is wrong)
4 + [( 6 - 9 ) + (8 + 9)] = 15 - [2 + ( 3 - 6 + 8 ) + 2] + x
4 + 6 - 9 + 8 + 9 = 15 - 2 + 3 - 6 + 8 + 2 + x
18 = 20 + x
18 - 20 = x
-2 = x
My algebra tutor would be horrified :D