Question

resolva as equações
20x+19-5x=7x+31+2x

Answer 1

20x -5x -7x -2x = -19 +31 
6x= 12
x= 12
      6
ou seja x=2

Answer 2

$20x+19-5x=7x+31+2x\\\\ 20x-5x+19=7x+2x+31\\\\ 15x+19=9x+31\\\\ 15x-9x=31-19\\\\ 15x-9x=31-19\\\\ 6x=12\\\\ x=\dfrac{12}{6}\\\\ \boxed{x=2}$