SOLUTION: x+y= 8 x-y= 10
-> -> SOLUTION: x+y= 8 x-y= 10
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x+y= 8 x-y= 10
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X+Y=8 & X-Y=10
X=8-Y 8-Y-Y=10 OR -2Y=2 OR Y=-1
X=8-(-1) OR X=9
PROOF 9-1=8 OR 8=8 & 9-(-1)=10 OR 9+1=10 or 10=10