Răspuns :
4+×=[(15-1):7-2+6+3)×5=>4+×=(14:7-2+6+3)×5=>4+×=(2-2+9)×5=>4+×=9×5=>4+×=45=>×=39
a=3×=>a=3×39=>a=117
Răspuns:
{2-[3+(4+x):5]-6]·7=15-1;2-[3+(4+x):5]-6=14:7; [3+(4+x):5]-6=2-2; 3+(4+x):5=0+6; (4+x):5=6-3; 4+x=3·5; x=15-4; x=11; a=3·X;a=3·11;a=33