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\frac{12}{6}=\sqrt{a-5}
Divide both sides by 6.
2=\sqrt{a-5}
Divide 12 by 6 to get 2.
\sqrt{a-5}=2
Swap sides so that all variable terms are on the left hand side.
a-5=4
Square both sides of the equation.
a-5-\left(-5\right)=4-\left(-5\right)
Add 5 to both sides of the equation.
a=4-\left(-5\right)
Subtracting -5 from itself leaves 0.
a=9
Subtract -5 from 4.