Respuesta :

N=r(A-s)

Divide each side by r

N/r = r/r ( A-s)

N/r = A-s

Subtract A from each side

N/r -A = A-s-A

(N/r) -A = -s

Multiply each side by -1

A - ( N/r) = s

Answer: s = A- ( N/r)

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