1/2x-1/y=-1 1/x+1/2y=7 solve it
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1/2x+11/x=1/2y+1/y=7
23/2x=3/2y=7
23*2y=3*2x=7
46y=6x=7
46/6y=x=7
23/3y=x=7
y=x*3/23=7
y=x=7*23/3
y=x=161/3
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