SOLUTION: I am a parent helping with homework. I am stumped on this one: Solve for r: S=(rL-a)/(r-1)

Question 12244: I am a parent helping with homework. I am stumped on this one:
Solve for r: S=(rL-a)/(r-1)
Answer by AdolphousC(70) (Show Source): You can put this solution on YOUR website!
This one seems confusing at first, but you just need to get the two r terms together so you can factor them out, here is how I did the problem

Mulitply (r-1) to get it out of the denominator
Distribute the S through r-1
now we need to get both r terms on one side of the equation so we can take the GCF of 'r' out

so we subtract rL from both sides

add S to both sides
Factor out the r on the left
Divide both sides by S - L

Hope that helps, Mr. C
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