Solve for F
F=-\frac{\sqrt{3}\left(r-12\right)}{3}
Solve for r
r=-\sqrt{3}F+12
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F\sqrt{3}=12-r
Subtract r from both sides.
\sqrt{3}F=12-r
The equation is in standard form.
\frac{\sqrt{3}F}{\sqrt{3}}=\frac{12-r}{\sqrt{3}}
Divide both sides by \sqrt{3}.
F=\frac{12-r}{\sqrt{3}}
Dividing by \sqrt{3} undoes the multiplication by \sqrt{3}.
F=\frac{\sqrt{3}\left(12-r\right)}{3}
Divide 12-r by \sqrt{3}.
r=12-F\sqrt{3}
Subtract F\sqrt{3} from both sides.
r=-\sqrt{3}F+12
Reorder the terms.
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