x+y=10
x-2y=7 ;
x=10-y
10-y-2y=7 ;
-3y=-3
x=10-y ;
y=1
x=9
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x+y=10
x-2y=7 ;
x=10-y
10-y-2y=7 ;
-3y=-3
x=10-y ;
y=1
x=9