Question

Tìm xEZ

a)2.(5+3x)+x=31

Answer 1

2.( 5 + 3x ) = 31

=> 2.5 + 2.3x + x = 31

=> 10 + 6x + x = 31

=> 10 + 7x = 31

=> 7x = 31 - 10

=> 7x = 21

=> x = 21 : 7

=> x = 3

Vậy x = 3

Answer 2

a)2.(5+3x)+x=31

  10+6x+x=31

   10+7x=31

    7x=31-10

     7x=21

      x=21:7

     x=3

Vậy x=3