Quick Algebra Question

Question

http://image.prntscr.com/image/d43e3522812b4943a3116669ce69f2f0.png

Solve for r. Thank you!

Answer 1

(r - 3) / √r = -√r

r - 3 = -r              multiply both sides by √r

-3 = -2r               subtract r from both sides

3/2 = r                divide both sides by -2