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2x+y=-6
3y-x=3/*2
2x+y=-6
6y-2x=6
y+2x=-6
7y=0
y=0
x=0
3y = x + 3
2x + y = -6
-x+3y=3 /*2
2x+y=-6
-2x+6y=6
2x+y=-6 +
----------------------------
7y=0 /7
y=0
-x+3y=3
y=0
-x+3*0=3
y=0
-x+0=3
y=0
-x=3 /(-1)
y=0
x=-3
y=0