Odpowiedzi

2010-01-17T18:19:51+01:00
3*9+2y=13
27+2y=13
2y=13-27
2y=-14 |:2
y=-7
2010-01-17T18:20:04+01:00
2010-01-17T18:20:09+01:00
3*9+2y=13
27+2y=13


27+2y=13
27+2y=13|-27

2y=-14 |:2

y=-7