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plot 7x+y-3=0, x+7y-3=0, (x-13/18)^2+(y-13/18)^2=(5sqr(2)/18)^2, (x-7/2)^2+(y-7/2)^2=(5sqr(2)/2)^2
plot 7x+y-3=0, x+7y-3=0, (x-13/18)^2+(y-13/18)^2=(5sqr(2)/18)^2, (x-7/2)^2+(y-7/2)^2=(5sqr(2)/2)^2
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