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5/2+x=5/3
x=5/3-5/2
x=-5/6
x-1/3=8/7
x=8/7+1/3
x=31/21
7/8+x=2/5
x=2/5-7/8
x=-19/40
x+4/9=2/9
x=2/9-4/9
x=-2/9
6/10+x=3/5
x=3/5-6/10
x=0
x-2/11=3/7
x=3/7+2/11
x=47/77
saludos