find the x 2x+y=12&x-y=9
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SINCE WE HAVE TWO EQUATION AS
2x+y=12...................................{1}
x-y=9.........................................{2}
form {2} we get,
y=x-9...................................{3}
putting in {1} we get,
2x+x-9=12
3x=12+9
3x=21
x=7
hence the value of x is 7.
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