Question

34 + ( 9-21) = 3417 - ( x + 3417)

Answer 1

34+(9-21)=3417-(x+3417)

34+(-12)=3417-3417+x

22=0+x

22=x

Vậy x=22

Answer 2

34+(9-21)=3417-(x+3417)

34+(-12)=3417-(x+3417)

22          =3417-(x+3417)

3417-22=x+3417

3395      =x+3417

3395-3417=x

x=-22

Answer 3

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