Do the problem little by little: First, -20/48 reduces to -5/12. Next, (t^5) / (t^7) simplifies to 1 / (t^2). Same with u^2 / u^4: 1 / u^2 v^3 / v^1 = v^2
Let's put the factors back together:
-5 * v^2 -------------------------- 12 * u^2 * t^2 -5 v This could be left as is, or shortened: ----- * [ ------- ]^2 12 t*u