Вычислите по действиям: (5/18+7/12)*2 10/31+1 13/51 \(4/17-20\51)

1) 5/18+7/12 = 10/36+21/36 = 31/36
2) 4/17-20/51 = 12/51-20/51 = -8/51
3) 31/36*72/31 = 2
4)64/51 : (-8/51)  = 64/51*(-51/8) = -8
5) 2+(-8) = -6