Another problem I just crossed. Going to be last for tonight, I need to rest.
Okay, he is what I've done.
Divided off the r and got
I multiplied both sides of the equation by the reciprocal
Now here's where I'm lost.
I made a typo in the previous equation ... the right side should be instead of
cross multiply ...
distribute on the left side ...
add 27 and subtract 7r from both sides ...
combine like terms on the left side ...
divide both sides by 20 ...
you're done.