I cannot figure out what I am missing for this Algebraic problem. I have the beginning equation and the answer equation but I do not understand the steps.

Question

I dont understand the algebraic steps to go from the equation on the left side of the arrow to the right side.

 

b(1+r/r)(sY/A)=((1-ϴ)Y/N_{Y)  --->} N_Y=(r/1+r)(((1-ϴ)A)/bs)

Answer 1

b((1+r)/r)(sY/A)=((1-ϴ)Y/N)

 

Multiply both sides by N, then by r/(1+r), then by A/bsY:

 

N= (1-θ)YAr/[(1+r))(b)(sY)]

 

N = ((1-θ)A/bs)·(r/(1+r))