Solve for r G a3 r r SolutionG a 3 r multiplying both

Solution

G = a / ( 3 - r)

multiplying both sides by (3-r)

G(3-r) = a

distributing G

3G - Gr = a

multiplying entire equation by -1

Gr - 3G = -a

adding 3G on both sides

Gr = 3G - a

dividing by G

r = ( 3G - a ) / G

or

r = ( 3 - a/G )