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n + n + 7 = 27 - n
2n + 7 = 27 - n
2n + n = 27 - 7
3n = 20
n = 20/3
Comprobación:
20/3 + 20/3 + 7 = 27 - 20/ 3
20 + 20 + 21 / 3 = 81 - 20 / 3
61 / 3 = 61 / 3
despejar ():
n+n+7=27-n
ordenar las variables de a un lado:
n+n+n=27-7
simplificar :
3n=20
despejar n :
n= 20/3
suerte!!!