Răspuns :
2×{30-[117+(202-196)×18]:9}=
2×[30-(117+6×18):9]=
2×[30-(117+108):9]=
2×(30-225:9)=
2×(30-25)=
2×5=10
2×[30-(117+6×18):9]=
2×[30-(117+108):9]=
2×(30-225:9)=
2×(30-25)=
2×5=10