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To find the restriction of the expression x/(x-y), we need to determine the values of x and y that would make the expression undefined. In this case, the restriction occurs when the denominator (x - y) equals zero, because division by zero is undefined.
So, we need to find the values of x and y that satisfy the equation x - y = 0.
Rearranging the equation, we get x = y.
Therefore, the restriction for the expression x/(x-y) is that x must be equal to y. This means that x cannot take any value while y is zero, because division by zero is undefined and leads to an undefined expression.