Răspuns :
notam acel numar cu x
x-3786+214=3218 => x=3218+3786-214=> x=6790
x-3786+214=3218 => x=3218+3786-214=> x=6790
N-numarul
N-3786+214=3218
N-3786=3218-214
N-3786=3004
N=3004+3786
N=6790
N-3786+214=3218
N-3786=3218-214
N-3786=3004
N=3004+3786
N=6790