Respostas

2014-04-12T21:56:58-03:00
2014-04-12T22:41:55-03:00
2x - 3 = 17
2x = 17 + 3
2x = 20 
x = 20 ÷ 2
x = 10 

Conferindo:
2 * 10 - 3 = 
20 - 3 = 
17