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Substitution methode:
y=2x-5
4x-y=7

I thought you do it like this:
4x-2x-5=7
2x-5=7
2x=12
x=6
But that's not right.. What did I do wrong?



Answer :

konrad509
It should be 4x-(2x-5)=7.

[tex]4x-(2x-5)=7\\ 4x-2x+5=7\\ 2x=2\\ x=1[/tex]

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