Respuestas

2013-06-10T09:43:26+02:00
X+2/3= 5/6
x= 5/6-2/3
x=1/6


x+5/7=-1/5
x=-1/5-5/7
x=-32/35
2013-06-10T10:18:54+02:00
X-2/3=-5/6
x=-5/6+2/3= (-5+4)/6 = -1/6
x+5/7=-1/5
x = -1/5 - 5/7 = ( -7 -25 )/35 = - 32/35