Divide both sides by v^2. You will get= 0. (1) Introduce new variable t = . Then equation (1) takes the form = 0. Factor left side (t+5)*(t-2) = 0. The roots are = - 5 and = 2. Hence, = -5 or = 2. ANSWER
(u + 5v)(u - 2v) = 0
u + 5v = 0 OR u - 2v = 0
u = - 5v OR u = 2v