Respostas

2014-06-26T21:30:07-03:00
-2x+1=-5x-20
-2x+5x= -1-20
3x= -21
x= 
 \frac{-21}{3}  
x= -7

obs: quando o numero muda de lado, o sinal dele tbm muda
  • Usuário do Brainly
2014-06-26T21:30:37-03:00
- 2x + 1 = - 5x - 20
- 2x + 5x = - 20 - 1
3x = - 21
x = - 21/3
x = - 7