13t-8 (3t-2) = -7t-5 (12-3t) 5 х-6-х=3 х - (4-2 х) - 2 (х+3) = 2 х-1 1,3 (t-0,6) = 1,8t

Найдем корни уравнений.

1) 13 * t - 8 * (3 * t - 2) = - 7 * t - 5 * (12 - 3 * t);

Раскроем скобки.

13 * t - 24 * t + 16 = - 7 * t - 60 + 15 * t;

-11 * t + 16 = 8 * t - 60;

-11 * t - 8 * t = - 60 - 16;

-19 * t = - 76;

19 * t = 76;

t = 76/19;

t = 4.

2) 5 * х - 6 - х = 3 * х - (4 - 2 * х)

Приведем подобные.

4 * x - 6 = 3 * x - 4 + 2 * x;

4 * x - 6 = 5 * x - 4;

4 * x - 5 * x = - 4 + 6;

-x = 2;

x = - 2.

3) - 2 * (х + 3) = 2 * х - 1;

-2 * x - 6 = 2 * x - 1;

-2 * x - 2 * x = - 1 + 6;

-4 * x = 5;

x = - 5/4;

x = - 1.25.

4) 1,3 * (t - 0,6) = 1,8 * t;

1.3 * t - 1.3 * 0.6 = 1.8 * t;

1.3 * t - 0.78 = 1.8 * t;

1.3 * t - 1.8 * t = 0.78;

-0.5 * t = 0.78;

t = - 0.78/0.5;

t = - 1.56.