Варіант 4. Номер 224
1) x + 5,74 = 9
x = 9 – 5,74
x = 3,26
2) 5,4 – x = 3,824
x = 5,4 – 3,824
x = 1,576
3) x – 5257 = 19,743
x = 19,743 + 5,257
x = 25
4) (29,3 – x) + 54 = 69,351
29,3 – x = 69,351 – 54
29,3 – x = 15,351
x = 29,3 – 15,351
x = 13,949