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2\sqrt{3}\left(\sqrt{3}-x\right)=15
Factor 12=2^{2}\times 3. Rewrite the square root of the product \sqrt{2^{2}\times 3} as the product of square roots \sqrt{2^{2}}\sqrt{3}. Take the square root of 2^{2}.
2\left(\sqrt{3}\right)^{2}-2\sqrt{3}x=15
Use the distributive property to multiply 2\sqrt{3} by \sqrt{3}-x.
2\times 3-2\sqrt{3}x=15
The square of \sqrt{3} is 3.
6-2\sqrt{3}x=15
Multiply 2 and 3 to get 6.
-2\sqrt{3}x=15-6
Subtract 6 from both sides.
-2\sqrt{3}x=9
Subtract 6 from 15 to get 9.
\left(-2\sqrt{3}\right)x=9
The equation is in standard form.
\frac{\left(-2\sqrt{3}\right)x}{-2\sqrt{3}}=\frac{9}{-2\sqrt{3}}
Divide both sides by -2\sqrt{3}.
x=\frac{9}{-2\sqrt{3}}
Dividing by -2\sqrt{3} undoes the multiplication by -2\sqrt{3}.
x=-\frac{3\sqrt{3}}{2}
Divide 9 by -2\sqrt{3}.