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3x - x = -2 - 8
2x= -10
x= -5
8+3x=x-2
reducimos a termoinos semejantes
3x-x=-2-8
2x=-10
el 2 q esta multiplicando pasa a dividir
simplificas la mitad
x=-5
el valor de x = -5
espero que te sirva suerte y saludos