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-2x=2 (multiplico x -1)
2x=2
x=2/2
x=1
x-1-3x=1 aqui sumas -3x mas x y da -4x
-4x-1=1
-4x=1+1
-4x=2
x=2/-4
x=-0.5
esa es la respuesta espero te sirva