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k/2 - 2k = -63
k/2 - 4/2k = -63
-3/2 k = -63
k = -63 * 2/-3
k = -126/-3
k = 42
El número es 42
Comprobémoslo:
La mitad de 42 = 42/2 = 21
El doble de 42 = 42*2 = 84
84-21 = 63
Saludos...
La mitad = m/2
El doble = 2m
Resolvemos.
m/2 + 63 = 2m
(m + 2 * 63)/2 = 2m
(m + 126)/2 = 2m
m + 126 = 2 (2m=
m + 126 = 4m
m - 4m = - 126
- 3m = - 126
m = - 126/-3
m = 42
Solución. El número es 42