Решите уровнения: 1) -7х-7=4-8х; 2)9-4х=-9х-4; 3)3-4х=-8х+9; 4) 2(Х-7)=3; 5) 5(Х-9) =

Найдем х.

1) -7 * х - 7 = 4 - 8 * х; 

-7 * x + 8 * x = 4 + 7;

x = 11.

2) 9 - 4 * х = -9 * х - 4; 

-4 * x + 9 * x = -4 - 9;

5 * x = -13;

x = -13/5;

x = -2.6.

3) 3 - 4 * х = -8 * х + 9; 

8 * x - 4 * x = 9 - 3;

4 * x = 6;

x = 6/4;

x = 1.5.

4) 2 * (Х - 7) = 3; 

x - 7 = 3/2;

x - 7 = 1.5;

x = 1.5 + 7;

x = 8.5.

5) 5 * (Х - 9) = -2; 

x - 9 = -0.4;

x = -0.4 + 9;

x = 8.6.

6) 3 = 4 * (х + 2); 

x + 2 = 0.75;

x = -1.25.

7) -7 = 5 * (х + 5); 

x + 5 = -7/5;

x + 5 = -2.4;

x = -2.4 - 5;

x = -7.4.

8) 9 = 5 * (х + 9); 

x + 9 = 1.8;

x = 1.8 - 9;

x = -8 + 0.8;

x = -7.2. 

9) 7 * (х - 1) = 3 * х; 

7 * x - 7 * 1 = 3 * x;

7 * x - 3 * x = 7;

4 * x = 7;

x = 7/4;

x = 1.75.

10) 9 * (х + 7) = -х; 

9 * x + 63 = -x; 

10 * x = -63; 

x = -6.3.