Răspunsuri

2014-07-28T11:56:25+03:00
{[(x-3)-10]-11}=x

x-3=a

a-10=b  =>b= x-3-10=x-13

b-11=c  =>c= x-13-11= x-24

a+b+c=x

x-3 +x-13+x-24=x

3x -40=x

3x-x=20

2x=20

x=10