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6 - (y + 4) = 5 - 2 (y - 1)
6 - y - 4 = 5 - 2y + 2
- y + 6 - 4 = - 2y + 5 + 2
- y + 2 = - 2y + 7
- y + 2y = 7 - 2
y = 5
Respuesta
y = 5