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12=\frac{\left(x+5\right)\sqrt{3}}{\left(\sqrt{3}\right)^{2}}
Rationalize the denominator of \frac{x+5}{\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
12=\frac{\left(x+5\right)\sqrt{3}}{3}
The square of \sqrt{3} is 3.
12=\frac{x\sqrt{3}+5\sqrt{3}}{3}
Use the distributive property to multiply x+5 by \sqrt{3}.
\frac{x\sqrt{3}+5\sqrt{3}}{3}=12
Swap sides so that all variable terms are on the left hand side.
x\sqrt{3}+5\sqrt{3}=12\times 3
Multiply both sides by 3.
x\sqrt{3}+5\sqrt{3}=36
Multiply 12 and 3 to get 36.
x\sqrt{3}=36-5\sqrt{3}
Subtract 5\sqrt{3} from both sides.
\sqrt{3}x=36-5\sqrt{3}
The equation is in standard form.
\frac{\sqrt{3}x}{\sqrt{3}}=\frac{36-5\sqrt{3}}{\sqrt{3}}
Divide both sides by \sqrt{3}.
x=\frac{36-5\sqrt{3}}{\sqrt{3}}
Dividing by \sqrt{3} undoes the multiplication by \sqrt{3}.
x=12\sqrt{3}-5
Divide 36-5\sqrt{3} by \sqrt{3}.