x + y = 6 ; x - y = 4
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x+y=6--------1
x-y=4---------2
adding equation 1 and 2
2x=10
x=5
subtracting equation 1 and 2
2y=2
y=1
x-y=4---------2
adding equation 1 and 2
2x=10
x=5
subtracting equation 1 and 2
2y=2
y=1
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