Question

5.(x:3-4)=15

Answer 1

x/3-4=3=>x/3=7=>x=21

Answer 2

5(x : 3 - 4) = 15

x : 3 - 14 = 15 : 5

x : 3 - 14 = 3

x : 3 = 14 + 3

x : 3 = 17

x = 17 . 3

x = 51

Answer 3

5. (x:3-4) = 15

x:3-4 = 15:5

x:3-4 = 3

x:3     = 3+4

x:3     = 7

x         = 7.3

x         = 21

Answer 4

5.(x:3-4)=15

x:3-4     =15:5

x:3-4     =3

x:3         =3+4

x:3         =7

   x         = 3.7=21

Answer 5

\(5\cdot\left(x:3-4\right)=15\)

\(x:3-4=15:5\)

\(x:3-4=3\)

\(x:3=3+4\)

\(x:3=7\)

\(x=7\cdot3\)

\(x=21\)

Vậy \(x=21\)