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x=\frac{\left(\sqrt{6}-\sqrt{3}\right)\sqrt{3}}{\left(\sqrt{3}\right)^{2}}
Rationalize the denominator of \frac{\sqrt{6}-\sqrt{3}}{\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
x=\frac{\left(\sqrt{6}-\sqrt{3}\right)\sqrt{3}}{3}
The square of \sqrt{3} is 3.
x=\frac{\sqrt{6}\sqrt{3}-\left(\sqrt{3}\right)^{2}}{3}
Use the distributive property to multiply \sqrt{6}-\sqrt{3} by \sqrt{3}.
x=\frac{\sqrt{3}\sqrt{2}\sqrt{3}-\left(\sqrt{3}\right)^{2}}{3}
Factor 6=3\times 2. Rewrite the square root of the product \sqrt{3\times 2} as the product of square roots \sqrt{3}\sqrt{2}.
x=\frac{3\sqrt{2}-\left(\sqrt{3}\right)^{2}}{3}
Multiply \sqrt{3} and \sqrt{3} to get 3.
x=\frac{3\sqrt{2}-3}{3}
The square of \sqrt{3} is 3.
x=\sqrt{2}-1
Divide each term of 3\sqrt{2}-3 by 3 to get \sqrt{2}-1.