-8x+6y=5 (*9)
6x+9y=-4 (*6)
-72x+54y=45
- 36x+54y=-24
_____________
-108x=69
x=-69/108
-8*(-69/108)+6y=5
=552/108+6y=5
=46/9+6y=5
6y=-46/9+45/9
6y=-1/9
y=-1/54
x=-69/108
y=-1/54
7x+5y=2 (*3)
21x+3y=1
21x+15y=6
- 21x+3y=1
______________
12y=5
y=5/12
7x+5*(5/12)=2
7x+25/12=2
7x=-25/12+24/12
7x=-1/12
x=-1/84
x=-1/84
y=-1/54