Is 48a^3-75a, equivalent to -3a(25-16a^2)? is it still equivalent even though 48a^3-75a, is written backwards?

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3