Question

1 over 2 < r over -3

Answer 1

\[\frac{ 1 }{ 2 }<\frac{ r }{ -3}\]

Answer 2

in this case, reverse the side of expressions so less than sign becomes greater than sign...
r/-3 > 1/2

Answer 3

now -3 when taken to right hand side becomes multiplication so
r > -3/2