Resposta :
1 + 3 - x = 1
2 2 mmc = 2
2 + 3 - 2x = 1
- 2x = 1 -3 - 2
-2x = - 4 x( -1)
2x = 4
x = 4/2
x = 2
2 2 mmc = 2
2 + 3 - 2x = 1
- 2x = 1 -3 - 2
-2x = - 4 x( -1)
2x = 4
x = 4/2
x = 2