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x-{-2x+x-2y)}-(-[-x]+2y)
x-{-x-2y}-(x+2y)
x+x+2y-x-2y
Se van las x y las 2y
Y queda solo "x"
Espero que te haya ayudado
x - { -2x + x - 2y } - (+x+2y )
x - { -x -2y } - x - 2y
x + x + 2y - x -2y
2x - x + 2y - 2y
x