Question

9x-8=5x+20Com a conta por favor

Answer 1

  9x - 8 = 5x +20

 9x - 5x = 20 +8

 4x = 28

 x = 28

   ______

       4

 x =  7

Answer 2

veja

$9x-8=5x+20 \\ 9x-5x=20+8 \\ 4x=28 \\ x=28\div4 \\ x=7 \\ S=\{7\}$