SOLUTION: -9/(4r) + 5/(3r) = -35/96 Need help solving the above equation

Algebra ->  Equations -> SOLUTION: -9/(4r) + 5/(3r) = -35/96 Need help solving the above equation      Log On


   

Question 905536: -9/(4r) + 5/(3r) = -35/96
Need help solving the above equation
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
start with -9%2F4%2Fr+%2B+5%2F3%2Fr+=+-35%2F96

multiply both sides of the equation by 12*r to get:

-9%2A3+%2B+5%2A4+=+-35%2A12%2Ar%2F96

multiply both sides of the equation by 96 to get:

-9%2A3%2A96+%2B+5%2A4%2A96+=+-35%2A12%2Ar

simplify to get:

-2592+%2B+1920+=+-420%2Ar

combine like terms to get:

-672+=+-420%2Ar

divide both sides of the equation by -420 to get:

-672%2F-420+=+r

simplify to get r+=+8%2F5

You can confirm the solution is correct by replacing r with 8/5 in the original equation to see if it holds true.

i did, using my calculator, and it is confirmed that the solution is good.