72960 : 19 87200 : 14 260 * 403 - (568 * 5 - 1840) =
57 3840 84 6800 = 260 * 403 - (2840 - 1840) =
159 32 = 260 * 403 - 1000 =
152 32 = 104780 - 1000 = 103780
76 0 671 * 223 + (6000 - 87 * 40) =
76 = 671 * 223 + ( 6000 - 3480) =
0 = 671 * 223 + 2520 =
= 149633 + 2520 =
= 152153