Реши уравнения. выполни проверку. 6 * (b-3) = 10-2 * (b+2) 83+5 * (y-3) = 3 * (8y-9)

1. 6 * (b - 3) = 10 - 2 * (b + 2);

6 * b - 6 * 3 = 10 - 2 * b - 2 * 2;

6b - 18 = 10 - 2b - 4;

6b + 2b = 10 - 4 + 18;

8b = 24;

b = 24 / 8;

b = 3.

Проверка:

6 * (3 - 3) = 10 - 2 * (3 + 2);

6 * 0 = 10 - 2 * 5;

0 = 10 - 10;

0 = 0.

2. 83 + 5 * (y - 3) = 3 * (8y - 9);

83 + 5 * y - 5 * 3 = 3 * 8y - 3 * 9;

83 + 5y - 15 = 24y - 27;

5y - 24y = - 27 - 83 + 15;

-19y = - 95;

y = - 95 : (-19);

y = 5.

Проверка:

83 + 5 * (5 - 3) = 3 * (8 * 5 - 9);

83 + 5 * 2 = 3 * (40 - 9);

83 + 10 = 3 * 31;

93 = 93.