1) x + 3*25 = 87x + 75 = 87x = 87 - 75x = 12
2) 8*17 - x = 107136 - x = 107-x = 107 - 136x = -29
3) 555 : 5 - x = 74111 - x = 74-x = 74 - 111x = -37
4) 2x + 87 = 932x = 93 - 872x = 6x = 3
5) 3*(35 - x) = 63105 - 3x = 63-3x = 63 - 105-3x = -42x = -42 / -3x = 14
6) (120 - x) ÷ 13 = 8120 - x = 13 * 8120 - x = 104-x = 104 - 120x = -16
Ответ: x = 12; -29; -37; 3; 14; -16.
1) x + 3*25 = 87
x + 75 = 87
x = 87 - 75
x = 12
2) 8*17 - x = 107
136 - x = 107
-x = 107 - 136
x = -29
3) 555 : 5 - x = 74
111 - x = 74
-x = 74 - 111
x = -37
4) 2x + 87 = 93
2x = 93 - 87
2x = 6
x = 3
5) 3*(35 - x) = 63
105 - 3x = 63
-3x = 63 - 105
-3x = -42
x = -42 / -3
x = 14
6) (120 - x) ÷ 13 = 8
120 - x = 13 * 8
120 - x = 104
-x = 104 - 120
x = -16
Ответ: x = 12; -29; -37; 3; 14; -16.