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If 13x+17y=43 and 17x+13y=47 then x+y=___________
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If 13x+17y=43 and 17x+13y=47 then x+y=___________

User Parkgrrr
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13x+17y+17x+13y=43+47 (LHS and RHS added to LHS and RHS respectively). x + y = 3 Ans.
User Alex Aparin
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