Solve for x
x=256
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\sqrt{x}-16-\left(-16\right)=-\left(-16\right)
Add 16 to both sides of the equation.
\sqrt{x}=-\left(-16\right)
Subtracting -16 from itself leaves 0.
\sqrt{x}=16
Subtract -16 from 0.
x=256
Square both sides of the equation.
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