( 7 - 1 5/12)÷6,7+(5,75-3 1/6 )÷15,5.Помагите

=( 6 12/12 - 1 5/12): 6,7 + (5 3/4 - 3 1/6) : 15,5 = 5 7/12 : 6 7/10 + (23/4 - 19/6) :15,5= 67/12* 10/67 + (69/12 - 38/12):15,5 = 10/12 + 31/12 : 155/10 = 10/12 + 31/12*2/31 = 10/12+2/12 = 12/12 = 1