If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x = 18.75^(1/2) // - 18.75^(1/2)
x-18.75^(1/2) = 0
x-18.75^(1/2) = 0 // + 18.75^(1/2)
x = 18.75^(1/2)
x = 18.75^(1/2)
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