SOLUTION: Solve the equation or formula for the variable specified. {{{3qr+9t=7u}}} for r

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Question 547227: Solve the equation or formula for the variable specified. 3qr%2B9t=7u for r
Answer by mathie123(224) About Me  (Show Source):
You can put this solution on YOUR website!
3qr%2B9t=7u
We need to isolate r.
One trick I learned is do your BEDMAS backwards. So starting with S/A, we see that we have +9t we must get rid of.
3qr%2B9t-9t=7u-9t
3qr=7u-9t
Okay, now there is no more addition or subtraction on the same side of the equation as the r. the next step is looking for any division or multiplication. We have a 3 and a q multiplied with the r, so we must divide these out.
3qr%2F3q=%287u-9t%29%2F3q
r=%287u-9t%29%2F3q
And there it is!