Solve for x
x=93
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x-12=81
Square both sides of the equation.
x-12-\left(-12\right)=81-\left(-12\right)
Add 12 to both sides of the equation.
x=81-\left(-12\right)
Subtracting -12 from itself leaves 0.
x=93
Subtract -12 from 81.
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