Solve for x
x=380
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20=\sqrt{20+x}
Multiply 4 and 5 to get 20.
\sqrt{20+x}=20
Swap sides so that all variable terms are on the left hand side.
x+20=400
Square both sides of the equation.
x+20-20=400-20
Subtract 20 from both sides of the equation.
x=400-20
Subtracting 20 from itself leaves 0.
x=380
Subtract 20 from 400.
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