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La cantidad que falta la llamas x
2/7 + x = 5
x = 5 - 2/7
x = (5 * 7)/7 - 2/7
x = 35/7 - 2/7
x = (35 - 2)/7
x = 33/7
Faltan 33/7
5/2 + x = 1
x = 1 - 5/2
x = 2/2 - 5/2
x = (2 - 5)/2
x = - 3/2
Faltan - 3/2
2/9 + x = 1
x = 1 - 2/9
x = 9/9 - 2/9
x = (9 - 2)/9
x = 7/9
Faltan 7/9
13/5 + x = 3
x = 3 - 13/5
x = 15/5 - 13/5
x = (15 - 13)/5
x = 2/5
Faltan 2/5