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El número que no conoces lo llamas x
3/5 + x = 2
x = 2 - 3/5
x = (2 * 5)/5 - 3/5
x = 10/5 - 3/5
x = (10 - 3)/5
x = 7/5
Respuesta
3/5 + 7/5 = 2
desarrollo:
3/5 +7/5 = 3+7=10 / 5
10 entre 5 = 2