-2by 5 -(1by 5 - 4by 5 ) =(2by 5 -(1 by 5))-4by 5
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-2/5-1/5-4/5=2/5-1/5-4/5
-2/5-1/5-4/5+1/5+4/5=2/5
-2/5=2/5
or
-2/5-2/5=0
-4/5=0
-2/5-1/5-4/5+1/5+4/5=2/5
-2/5=2/5
or
-2/5-2/5=0
-4/5=0
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