Explicación paso a paso:
[tex]6x - (2x + 1) = - ( - 5x + ( - ( - 2 - 1)))[/tex]
[tex]6x - 2x - 1 = 5x - 2 - 1 \\ 4x - 1 = 5x - 3 \\ 4x - 5x = - 3 + 1 \\ - x = - 2 \\ 2 = x[/tex]