x-3y=6

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x=6y=-2

(x-6)/3=y or (x/3)-2=yThis can be true for more than just x=6, y=-2. Just come up with any value of x and there is a unique value for y corresponding to it. e.g. Iff x=1, y=-5/3. Iff x=3, y=-2. Iff x=-6, y=-4. Iff x=0, y=-2. etc.