Solve for a
a=81
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\sqrt{a}-20-\left(-20\right)=-11-\left(-20\right)
Add 20 to both sides of the equation.
\sqrt{a}=-11-\left(-20\right)
Subtracting -20 from itself leaves 0.
\sqrt{a}=9
Subtract -20 from -11.
a=81
Square both sides of the equation.
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