x1/4 + (x1 - x2)/3 + (x1+40)/6 + (x1+40 - x2)/2=0, (x2 - x1)/3 + (x2 - (x1 +40))/2 -16=0x1/4 + (x1 - x2)/3 + (x1+40)/6 + (x1+40 - x2)/2=0, (x2 - x1)/3 + (x2 - (x1 +40))/2 -16=0

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