Solve for r

[nycmathguy]

 

[MathLover1]

if you have drt -r=-d then you factor out r
r(dt -1)=-d
r=-d/(dt -1)

 

[nycmathguy]

if you have drt -r=-d then you factor out r
r(dt -1)=-d
r=-d/(dt -1)

I see my error. Thanks.