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-2\sqrt{2-y}=2-4
Multiply both sides of the equation by -2.
-2\sqrt{2-y}=-2
Subtract 4 from 2 to get -2.
\sqrt{2-y}=\frac{-2}{-2}
Divide both sides by -2.
\sqrt{2-y}=1
Divide -2 by -2 to get 1.
-y+2=1
Square both sides of the equation.
-y+2-2=1-2
Subtract 2 from both sides of the equation.
-y=1-2
Subtracting 2 from itself leaves 0.
-y=-1
Subtract 2 from 1.
\frac{-y}{-1}=-\frac{1}{-1}
Divide both sides by -1.
y=-\frac{1}{-1}
Dividing by -1 undoes the multiplication by -1.
y=1
Divide -1 by -1.