Task: Question Understanding
Input (English): Let j be 2 + (1 - -20 - -1). Suppose 0 = 2*h + 4*n - j, n + 2*n - 15 = 0. Let r = -46 - -51. Solve r*q + 1 = -0*q + x, 0 = h*q + 4*x - 4 for q.
Output (English): algebra