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\sqrt{2}x-x=2-\sqrt{2}-\sqrt{2}
Subtract \sqrt{2} from both sides.
\sqrt{2}x-x=2-2\sqrt{2}
Combine -\sqrt{2} and -\sqrt{2} to get -2\sqrt{2}.
\left(\sqrt{2}-1\right)x=2-2\sqrt{2}
Combine all terms containing x.
\frac{\left(\sqrt{2}-1\right)x}{\sqrt{2}-1}=\frac{2-2\sqrt{2}}{\sqrt{2}-1}
Divide both sides by \sqrt{2}-1.
x=\frac{2-2\sqrt{2}}{\sqrt{2}-1}
Dividing by \sqrt{2}-1 undoes the multiplication by \sqrt{2}-1.
x=-2
Divide 2-2\sqrt{2} by \sqrt{2}-1.