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x - 2x - 1 = 8 -3x - 3
x - 2x+ 3x = 8 - 3 + 1
2x = 6
x = 6 : 2
x = 3
verificación
3 - 2*3 - 1 = 8 - 3*3 - 3
-4 = -4
saludos
x-2x-1 = 8-3x-3
x-2x+3x = 8-3+1
2x. = 6
x. = 6/2
x. = 3