Solve for u
u=39
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u-3=36
Square both sides of the equation.
u-3-\left(-3\right)=36-\left(-3\right)
Add 3 to both sides of the equation.
u=36-\left(-3\right)
Subtracting -3 from itself leaves 0.
u=39
Subtract -3 from 36.
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