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: -x/2+3/2<5/2=x>-2
-x/2+3/2-3/2= -x/2<5/2-3/2=1
-x/2<1
-x/2/2= -x<1/2
-x can be transformed into -1/2x
-1/2x / -1/2=x
1/-1/2=-2
x>-2
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