Verified Answer :

Simplifying
r = 6km

Solving
r = 6km

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Simplifying
r = 6km

To solve this equation, the goal is to isolate the variable m on one side of the equation.

To do this, divide both sides by 6k -- this will give you R over 6k on the left side and m on the right side.
R/6k = m

(I'm guessing this is what you meant; however, the equation looks like it could also mean "rate equals six kilometers [an hour]".)