Answer: 12 and 8/9
Explanation:
(2a-1/3)/(b/15) a = -4/5 and b = -9/4 simplify everything into fractions
(-8/5-1/3)/(-9/60) Plug in your values and then find common denominators
(-24/15-5/15)/(-9/60) combine the like terms
(-29/15)/(-9/60) Find a common factor between the two
(-116/60)/(-9/60) divide, the denominators and negatives will cancel out
116/9 for this step 12 * 9 = 108, 116 - 108 = 8
so for your answer you get 12 + 8/9