56:14 + 14*7 -56 = 46
56:14 = 4
14*7= 98
98+4 = 102
102-56=46
92-70:5+15 = 93
70:5= 14
92-14= 78
78+15=93
90*4-63:(56397-56390)= 351
56397-56390=7
90*4 =360
63:7=9
360-9=351