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28\sqrt{5}-x-x=1
Subtract x from both sides.
28\sqrt{5}-2x=1
Combine -x and -x to get -2x.
-2x=1-28\sqrt{5}
Subtract 28\sqrt{5} from both sides.
\frac{-2x}{-2}=\frac{1-28\sqrt{5}}{-2}
Divide both sides by -2.
x=\frac{1-28\sqrt{5}}{-2}
Dividing by -2 undoes the multiplication by -2.
x=14\sqrt{5}-\frac{1}{2}
Divide 1-28\sqrt{5} by -2.