64. 8070*600 5010-15900:100-786 9800-30 30200-7020:10*3+68

8070 * 600 = **4842000** 5010 - 15900 : 100 - 786 = 5010 - 159 - 786 = 5010 - 945 = **4065** 9800 - 30 = **9770** 30200 - 7020 : 10 * 3 + 68 = 30200 - 702 * 3 + 68 = 30200 - 2106 + 68 = 30268 - 2106 = **28162**