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despejas x:
sea x dicho numero
x=4(x+21)
x=4x+84
3x=-84
x=-84/3=-28
x=-28
La cuarta parte del número = x/4
Resolvemos :
x/4 = x + 21
x = 4x + 4 . 21
x = 4x + 84
x - 4x = 84
- 3x = 84
x = 84/-3
x = - 28
Solución : El número es - 28
COMPROBAMOS :
x/4 = x + 21
-28/4 = -28 + 21
-7 = - 7
La solución es correcta.