Respostas

2014-08-21T21:46:18-03:00
5y-5+4y+23=180
9y=180-23+5
9y=162
y=162/ 9
y=18
1 5 1
2014-08-22T16:17:17-03:00
5y - 5 + 4y + 23 = 180
5y + 4y - 5  + 23 = 180
9y - 5  + 23 = 180
9y+18=180
9y=180-18
9y=162
y=162/9
y=18