(15 + x) × 4 = 88
15 + x = 88 : 4
15 + x = 22
x = 22 - 15
x = 7
96 : x + 27 = 33
96 : x = 33 - 27
96 : x = 6
x = 96 : 6
x = 16
51 : (x – 29) = 17
x – 29 = 51 : 17
x – 29 = 3
x = 3 + 29
x = 32
Ответ: x = 7; x = 16; x = 32