Derive surface brightness formula

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Zapped17
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Homework Statement
How to derive derive formula for surface brightness that converts mag/arcsec^2 to L⊙/pc^2?
Relevant Equations
S(mag/arcsec^2) = M⊙ + 21.572 -2.5 log_{10} S(L⊙/pc^2)
Derive formula for surface brightness
The formula in question we wanna derive is:
S(mag/arcsec^2) = M⊙ + 21.572 -2.5 log_{10} S(L⊙/pc^2).
Best regards.