13t-8(3t-2)=-7t-5(12-3t) 5х-6-х=3х-(4-2х) -2(х+3)=2х-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 сходственные.

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.