solve equation x+y=9 , x+6=9
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x+6=9
x=9-6
x=3
Now put the value of x in x+y=9 , we will get
x+y=9
3+y=9
y=9-3
y=6
x=9-6
x=3
Now put the value of x in x+y=9 , we will get
x+y=9
3+y=9
y=9-3
y=6
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