1) 8*17 - x = 107
=> 136 - x = 107
=> -x = 107 - 136
=> -x = -29
=> x = 29

2) 555 : 5 - x = 74
=> 111 - x = 74
=> -x = 74 - 111
=> -x = -37
=> x = 37

Поэтому, x = 29 и x = 37.