1/T - 1/M = 1/R



Add 1/M to both sides, subtract 1/R from both sides:

1/T - 1/R = 1/M



Take reciprocal of both sides:

1/(1/T - 1/R) = M



Re-writing with M on LHS:









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Just in case the student is wondering, the other tutor's answer is just a different form for the one I provided:  



    =  = 



Also note the implied restrictions: , ,  

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
 1/T - 1/M = 1/R

1/M = 1/T - 1/R = (R-T)/RT

M = RT/(R-T) 

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