Question 350686
What is the ; in your problem? Is that a typo?
If not I worked the problem correctly as:

r+2r<309

Since r and 2r are like terms, add 2r to r to get 3r.
3r<309

Divide each term in the inequality by 3.
(3r)/(3)<(309)/(3)

Simplify the left-hand side of the inequality by canceling the common factors.
r<(309)/(3)

Simplify the right-hand side of the inequality by simplifying each term.
r<103