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-\left(-2\right)=\left(m-1\right)\sqrt{2}
Variable m cannot be equal to 1 since division by zero is not defined. Multiply both sides of the equation by 2\left(m-1\right), the least common multiple of 2-2m,2.
2=\left(m-1\right)\sqrt{2}
Multiply -1 and -2 to get 2.
2=m\sqrt{2}-\sqrt{2}
Use the distributive property to multiply m-1 by \sqrt{2}.
m\sqrt{2}-\sqrt{2}=2
Swap sides so that all variable terms are on the left hand side.
m\sqrt{2}=2+\sqrt{2}
Add \sqrt{2} to both sides.
\sqrt{2}m=\sqrt{2}+2
The equation is in standard form.
\frac{\sqrt{2}m}{\sqrt{2}}=\frac{\sqrt{2}+2}{\sqrt{2}}
Divide both sides by \sqrt{2}.
m=\frac{\sqrt{2}+2}{\sqrt{2}}
Dividing by \sqrt{2} undoes the multiplication by \sqrt{2}.
m=\sqrt{2}+1
Divide 2+\sqrt{2} by \sqrt{2}.