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[@RyanLewis-Johnson-wq6xs]

It’s in my head.

[@RyanLewis-Johnson-wq6xs]

a/Sqrt[a]=15 a=225 225/Sqrt[225]=15 solution

[@RealQinnMalloryu4]

3^5(a ➖ 5a+3).

[@veijolalli326]

a/sqrt(a)=15 |*sqrt(a)
sqrt(a)=15
a=15^2= 225
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225/15=15