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4y is equal to 4y so if you add one to that number it cannot be equal to the number minus 1.
The equations x=4y+1 and x=4y-1 have no solutions in common.
Graphically, these are parallel lines and thus have no common points.
Numerically, it is clear that for any given y, 4y+1>4y-1 so the associated x-values cannot be the same.
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