Task: Question Understanding
Input (English): Let f(p) = 5*p**3 - p**2 + p - 1. Let b be f(1). Suppose -2*u + 2*y = 3*u - 10, -b*u - 3*y - 15 = 0. Solve u = 4*j - 3*j for j.
Output (English): algebra