Which of the following linear Diophantine equations has integer solutions?
6x+9y=56x + 9y = 56x+9y=5
8x+12y=78x + 12y = 78x+12y=7
15x+10y=2515x + 10y = 2515x+10y=25
7x+14y=97x + 14y = 97x+14y=9