Solve for x
x=20
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x-16=4
Square both sides of the equation.
x-16-\left(-16\right)=4-\left(-16\right)
Add 16 to both sides of the equation.
x=4-\left(-16\right)
Subtracting -16 from itself leaves 0.
x=20
Subtract -16 from 4.
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