How would I solve 7r=-7/2? I know the answer is - 1/2 I just don't understand how to get - 1/2 as my answer.

7r=-7/2

divide both sides by 7 to get r by itself

(7r) / (7) = (-7/2) / (7)

if you don't quite see it, think of multiplying both sides by 1/7 instead (its the same thing as dividing by 7)

(7r) * (1/7) = (-7/2) * (1/7)

r=-1/2