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x=\frac{6\sqrt{2}\left(6+\sqrt{2}\right)}{\left(6-\sqrt{2}\right)\left(6+\sqrt{2}\right)}
Rationalize the denominator of \frac{6\sqrt{2}}{6-\sqrt{2}} by multiplying numerator and denominator by 6+\sqrt{2}.
x=\frac{6\sqrt{2}\left(6+\sqrt{2}\right)}{6^{2}-\left(\sqrt{2}\right)^{2}}
Consider \left(6-\sqrt{2}\right)\left(6+\sqrt{2}\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
x=\frac{6\sqrt{2}\left(6+\sqrt{2}\right)}{36-2}
Square 6. Square \sqrt{2}.
x=\frac{6\sqrt{2}\left(6+\sqrt{2}\right)}{34}
Subtract 2 from 36 to get 34.
x=\frac{36\sqrt{2}+6\left(\sqrt{2}\right)^{2}}{34}
Use the distributive property to multiply 6\sqrt{2} by 6+\sqrt{2}.
x=\frac{36\sqrt{2}+6\times 2}{34}
The square of \sqrt{2} is 2.
x=\frac{36\sqrt{2}+12}{34}
Multiply 6 and 2 to get 12.
x=\frac{18}{17}\sqrt{2}+\frac{6}{17}
Divide each term of 36\sqrt{2}+12 by 34 to get \frac{18}{17}\sqrt{2}+\frac{6}{17}.