Ayuda Ecuacion con Fracciones: 4/9-n= -1/3
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4/9 - n = - 1/3
4/9 + 1/3 = n
4/9 + 3/9 = n
(4 + 3)/9 = n
7/9 = n
Comprobación.
4/9 - n = - 1/3
4/9 - 7/9 = - 1/3
(4 - 7)/9 = - 1/3
- 3/9 = - 1/3
-1/3 = - 1/3