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x\sqrt{3}=3\sqrt{3}\left(20-x\right)
Multiply both sides of the equation by 3.
x\sqrt{3}=60\sqrt{3}-3\sqrt{3}x
Use the distributive property to multiply 3\sqrt{3} by 20-x.
x\sqrt{3}+3\sqrt{3}x=60\sqrt{3}
Add 3\sqrt{3}x to both sides.
4x\sqrt{3}=60\sqrt{3}
Combine x\sqrt{3} and 3\sqrt{3}x to get 4x\sqrt{3}.
4\sqrt{3}x=60\sqrt{3}
The equation is in standard form.
\frac{4\sqrt{3}x}{4\sqrt{3}}=\frac{60\sqrt{3}}{4\sqrt{3}}
Divide both sides by 4\sqrt{3}.
x=\frac{60\sqrt{3}}{4\sqrt{3}}
Dividing by 4\sqrt{3} undoes the multiplication by 4\sqrt{3}.
x=15
Divide 60\sqrt{3} by 4\sqrt{3}.