m+f =39 ani impreuna ( in urma cu 2 ani)
39+|___|___|+|___|___|=43 ani au impreuna acum
43+|___|___|___|___|___|+|___|___|___|___|___|=53 ani vor avea impreuna peste 5 ani.
213+459-370=303
303+370+449=213
858-576+309=591
591+309+576=858
1085-[723+95]=267
[267+818]=1085
3406+5275-2903=5778
5778+2903-5275=3406
[3509-1989]+[1875-298]=2994
2994-1577=1417
[7306+1398]+[2099+1005]=11808
11808-8704=3104