1) 14x+4x-48=2402) 25b-7b-9=2793) 16a-7a+96=2224) 20y+5y+19=227

1) 14 x + 4 x - 48 = 240,

18 х = 240 + 48,

18 х = 288,

х = 288 : 18,

х = 16.

Проверка:

14 * 16 + 4 * 16 - 48 = 240,

240 = 240.

2) 25 b - 7 b - 9 = 279,

18 b = 279 + 9,

18 b = 288,

b = 288 : 18,

b = 16.

Проверка:

25 * 16 - 7 * 16 - 9 = 279,

279 = 279.

3) 16 a - 7 a + 96 = 222,

9 а = 222 - 96,

9 а = 126,

а = 126 : 9,

а = 14.

Проверка:

16 * 14 - 7 * 14 + 96 = 222,

222 = 222.

4) 20 y + 5 y + 19 = 227,

25 у = 227 - 19,

25 у = 208,

у = 208 : 25,

у = 8,32.

Проверка:

20 * 8,32 + 5 * 8,32 + 19 = 227,

227 = 227.