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    How to solve a double incognite equation?

    Hello! Im new here! And i really like this site! So heres is my problem: Well i know how to solve a simple equation with 2 incognites like: x+y=2 x+4=2y So in this case i do a substitue y=x-2 and use it in the second equation and it would be like: x+4=2(x-2) But the problem is...
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