Question 1124193
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Solve for s and r.

F = pr / M - sr
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suspecting you mean  F=pr/(M-sr)


{{{F=pr/(M-sr)}}}


(some steps are combined, but they do not all need to be.)


{{{F(M-sr)=pr}}}


{{{FM-Fsr=pr}}}


{{{FM=pr+Fsr}}}


{{{FM=r(p+Fs)}}}


{{{highlight(r=FM/(p+Fs))}}}