Solve for a
a=-\frac{3\sqrt{5}}{2}+9-3\sqrt{7}\approx -2.291355899
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2a=18-3\sqrt{5}-6\sqrt{7}
Subtract 6\sqrt{7} from both sides.
\frac{2a}{2}=\frac{18-3\sqrt{5}-6\sqrt{7}}{2}
Divide both sides by 2.
a=\frac{18-3\sqrt{5}-6\sqrt{7}}{2}
Dividing by 2 undoes the multiplication by 2.
a=-\frac{3\sqrt{5}}{2}+9-3\sqrt{7}
Divide 18-3\sqrt{5}-6\sqrt{7} by 2.
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