540. Решите уравнение: а) (2/3 х-4/5) * 15=8

(2/3 х - 4/5) * 15 = 8;

2/3 х - 4/5 = 8 : 15;

2/3 х = 8/15 + 4/5;

Приведем к общему знаменателю:

2/3 х = 8/15 + 12/15;

2/3 х = 20/15 = 4/3;

х = 4/3 : 2/3;

х = 4/3 * 3/2;

х = 2;

(2/3 * 2 - 4/5) * 15 = 8;

(4/3 - 4/5) * 15 = 8;

(20/15 - 12/15) * 15 = 8;

8/15 * 15 = 8;

8 = 8.