{2x+y/3-2y=0 2(2x+y)-5=7y

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{2x+y/3-2y=0 2(2x+y)-5=7y
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{2x+y/3-2y=0 2(2x+y)-5=7y
{2x+y/3-2y=0 2(2x+y)-5=7y

{2x+y/3-2y=0 2(2x+y)-5=7y
x=-2.5
y=-3

{2x+y/3-2y=0 (1)
{2(2x+y)-5=7y (2)
由(1)得2x+y=0→ -2x=y(3)
(3)代入(2)得:2(2x-2x)-5=7*(-2x)→ -5=-14x → x=5/14 (4)
(4)代入(3)得:y=-5/7
∴{x=5/14,y=-5/7