Solve for d
d=232-\sqrt{3}\approx 230.267949192
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3\sqrt{3}+3d=36+660
Multiply 12 and 3 to get 36.
3\sqrt{3}+3d=696
Add 36 and 660 to get 696.
3d=696-3\sqrt{3}
Subtract 3\sqrt{3} from both sides.
\frac{3d}{3}=\frac{696-3\sqrt{3}}{3}
Divide both sides by 3.
d=\frac{696-3\sqrt{3}}{3}
Dividing by 3 undoes the multiplication by 3.
d=232-\sqrt{3}
Divide 696-3\sqrt{3} by 3.
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