Eliminar parentesis y simplifica
[(2x+3y-6z) + (3x+10y-z] - (2x-3y-6z)=
[(2x+3y-6z) + (3x+10y-z] - (2x-3y-6z)=
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2x+3y-6z+3x+10y-z-2x+3y+6z (el signo menos cambia todo dentro del
paréntesis)
ordenando:
2x+3x-2x+3y+10y+3y-6z-z+6z
3x+16y-z
saludos!!