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x+3b>=2a
x>=2a-3b
2/3a+x<=2b
x<=2b-2/3a
所以2a-3b<=x<=2b-2/3a
-5<=x<=2
所以2a-3b=-5 (1)
2b-2/3a=2 (2)
a=-2,b=1/3
x>=2a-3b
2/3a+x<=2b
x<=2b-2/3a
所以2a-3b<=x<=2b-2/3a
-5<=x<=2
所以2a-3b=-5 (1)
2b-2/3a=2 (2)
a=-2,b=1/3
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