Solve for x
x=18
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x-9=9
Square both sides of the equation.
x-9-\left(-9\right)=9-\left(-9\right)
Add 9 to both sides of the equation.
x=9-\left(-9\right)
Subtracting -9 from itself leaves 0.
x=18
Subtract -9 from 9.
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