First in order to solve you need to get rid of the fraction. You can do so by multiplying to entire equation by the denominator like so...
5(5r - 1/5) = (4/5)5 25r - 1 = 4 Then to isolate the variable you need to add 1 to both sides. 25r = 5 Then you divide. r = 5/25 Simplify. r = 1/5 I hope this helps love! :)
