Уравнение: 1) (x-13,8) * 2,6=39,52 2) (7x-24) : 6+26=29 3) (99-9y) * 8+14=86

1) (x - 13,8) * 2,6 = 39,52

x - 13,8 = 39,52/2,6;

x - 13,8 = 15,2;

x = 15,2 + 13,8;

x = 29.

Ответ: x = 29.

2) (7 * x - 24) : 6 + 26 = 29

(7 * x - 24) : 6 = 29 - 26;

(7 * x - 24) : 6 = 3;

7 * x - 24 = 3 * 6;

7 * x - 24 = 18;

7 * x = 18 + 24;

7 * x = 42;

x = 42/7;

x = 6.

Ответ: x = 6.

3) (99 - 9 * y) * 8 + 14 = 86;

(99 - 9 * y) * 8 = 86 - 14;

(99 - 9 * y) * 8 = 72;

99 - 9 * y = 72/8;

99 - 9 * y = 9;

-9 * y = 9 - 99;

-9 * y = - 90;

9 * y = 90;

y = 90/9;

y = 10.

Ответ: y = 10.