Question

tìm x biết;15+39(5x-6)=72

Answer 1

15+39(5x-6)=72

<=>39(5x-6)=57

<=>5x-6=19/13

<=>5x=97/13

<=>x=97/65

Answer 2

15+39.(5x-6)= 72

       39.(5x-6)= 72-15

       39.(5x-6)= 57

        5x-6= 57:39

          5x-6= \(\frac{19}{13}\)

           5x= \(\frac{19}{13}+6\)

           5x= \(\frac{19}{13}+\frac{78}{13}\)

            5x= \(\frac{97}{13}\)

              x= \(\frac{97}{13}:5\)

              \(x=\frac{97}{13}.\frac{1}{5}\)

               \(x=\frac{97}{65}\)