{3分之y减6分之x加1=3,2(x-2分之y)=3（x加18分之y
y/3-(x+1/6)=3
2y-6x=19 (1)
2(x-y/2)=3(x+y/18)
2x-y=3x+y/6
12x-6y=18x+y
6x=7y (2)
(1)+(2)
2y=19+7y
y=-19/5
x=-133/30