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x=3\times \frac{10\sqrt{3}\left(3+\sqrt{3}\right)}{\left(3-\sqrt{3}\right)\left(3+\sqrt{3}\right)}+\sqrt{3}
Rationalize the denominator of \frac{10\sqrt{3}}{3-\sqrt{3}} by multiplying numerator and denominator by 3+\sqrt{3}.
x=3\times \frac{10\sqrt{3}\left(3+\sqrt{3}\right)}{3^{2}-\left(\sqrt{3}\right)^{2}}+\sqrt{3}
Consider \left(3-\sqrt{3}\right)\left(3+\sqrt{3}\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=3\times \frac{10\sqrt{3}\left(3+\sqrt{3}\right)}{9-3}+\sqrt{3}
Square 3. Square \sqrt{3}.
x=3\times \frac{10\sqrt{3}\left(3+\sqrt{3}\right)}{6}+\sqrt{3}
Subtract 3 from 9 to get 6.
x=\frac{10\sqrt{3}\left(3+\sqrt{3}\right)}{2}+\sqrt{3}
Cancel out 6, the greatest common factor in 3 and 6.
x=\frac{30\sqrt{3}+10\left(\sqrt{3}\right)^{2}}{2}+\sqrt{3}
Use the distributive property to multiply 10\sqrt{3} by 3+\sqrt{3}.
x=\frac{30\sqrt{3}+10\times 3}{2}+\sqrt{3}
The square of \sqrt{3} is 3.
x=\frac{30\sqrt{3}+30}{2}+\sqrt{3}
Multiply 10 and 3 to get 30.
x=15\sqrt{3}+15+\sqrt{3}
Divide each term of 30\sqrt{3}+30 by 2 to get 15\sqrt{3}+15.
x=16\sqrt{3}+15
Combine 15\sqrt{3} and \sqrt{3} to get 16\sqrt{3}.