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X=-1
7 - {x - [2x - (19 - x)]} = 3x - 11
7 - {x - [2x - 19 + x]} = 3x - 11
7 - {x - [2x + x - 19]} = 3x - 11
7 - {x - [3x - 19]} = 3x - 11
7 - {x - 3x + 19} = 3x - 11
7 - { - 2x + 19} = 3x - 11
7 + 2x - 19 = 3x - 11
7 - 19 + 2x = 3x - 11
- 12 + 2x = 3x - 11
- 12 + 11 = 3x - 2x
- 1 = x