(x+y)/2 - 3/7y =19 |×14
7x+7y-6y=266
7x+y=266
7x=266-y
x=38-1/7y
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(x+y)/2 - 3/7y =19 |×14
7x+7y-6y=266
7x+y=266
7x=266-y
x=38-1/7y