3x-2y=-1
2x+5y=12
2x+5y=12
3x-2y=-1
2x+5y=12
15x-10y=-5
4x+10y=12
15x-10y+4x+10y=-5+12
15x+4x=7
19x=7
x=7/19
3*7/19-2y=-1
21/19-2y=-1
2y=-1-21/19
2y=-19/19-21/19
2y=-40/19
y=(-40/19)/2
y=-40/38
y=-20/19