{(24 - 9 + 21) * 2 + 9 }* 3 - [(4 + 16)* 4 - 50] = (36 * 2 + 9 ) * 3 - (20 * 4 - 50) = (72 + 9) * 3 - (80 - 50) = 81 * 3 - 30 = 243 - 30 = 313
10 * {2 + 10 * [140 + 5 * (25 + 100)]} - 1913 * 40 = 10 * { 2 + 10 * [140 + 5 * 125]} - 76520 = 10 * [ 2 + 10 * (140 + 625)] - 76520 = 10 * (2 + 10 * 765) - 76520 = 10 * (2 + 7650) - 76520 = 10 * 7652 - 76520 = 76520 - 76520 = 0