Solving Equation Involving Radical

How do you solve this?
 (√4x + 5) + 8 = 2

(√4x + 5) + 8 = 2
(√4x + 5) = -6  {subtracted 8 from both sides}
4x + 5 = 36  {squared both sides....square root sign disappears}
4x = 31  {subtracted 5 form both sides}
x = 31/4  {divided both sides by 4}

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