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3\sqrt{3}x=\left(100+x\right)\sqrt{3}
Multiply both sides of the equation by 3.
3\sqrt{3}x=100\sqrt{3}+x\sqrt{3}
Use the distributive property to multiply 100+x by \sqrt{3}.
3\sqrt{3}x-x\sqrt{3}=100\sqrt{3}
Subtract x\sqrt{3} from both sides.
2\sqrt{3}x=100\sqrt{3}
Combine 3\sqrt{3}x and -x\sqrt{3} to get 2\sqrt{3}x.
\frac{2\sqrt{3}x}{2\sqrt{3}}=\frac{100\sqrt{3}}{2\sqrt{3}}
Divide both sides by 2\sqrt{3}.
x=\frac{100\sqrt{3}}{2\sqrt{3}}
Dividing by 2\sqrt{3} undoes the multiplication by 2\sqrt{3}.
x=50
Divide 100\sqrt{3} by 2\sqrt{3}.