SOLUTION: I cant figure out -r=38?

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Question 227644: I cant figure out -r=38?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
-r=38

Consider the -r as -1r

-1r=38

Divide both sides by the coefficient of r, which
is -1

%28-1r%29%2F%28-1%29=38%2F%28-1%29

%28cross%28-1%29r%29%2F%28cross%28-1%29%29=38%2F%28-1%29

r=-38

Edwin