3分之2(X-Y)-4分之X+Y=-1,
8(X-Y)-3(X+Y)=-12
8X-8Y-3X-3Y=-12
5X-11Y=-12(1)
6(X+Y)-4(2X-Y)=16
6X+6Y-8X+4Y=16
-X+5Y=8 (2)
(1)+(2)*5
5X-11Y-5X+25Y=-12+40
14Y=28
Y=2
X=2