Решите уравнения рациональным способом (2 х+5) * 6=78 (3 х-10) * 4=20 (2x-9) : 5=3 (7x+3) : 6=4 (10x-27) * 5=15 (8x+3) : 7=5

1) (2 * x + 5) * 6 = 78;

2 * x + 5 = 78 / 6;

2 * x + 5 = 13;

2 * x = 13 - 5;

2 * x = 8;

x = 8 / 2;

x = 4.

2) (3 * x - 10) * 4 = 20;

3 * x - 10 = 20 / 4;

3 * x - 10 = 5;

3 * x = 5 + 10;

3 * x = 15;

x = 15 / 3;

x = 5.

3) (2 * x - 9) / 5 = 3;

2 * x - 9 = 3 * 5;

2 * x - 9 = 15;

2 * x = 15 + 9;

2 * x = 24;

x = 24 / 2;

x = 12.

4) (7 * x + 3) / 6 = 4;

7 * x + 3 = 4 * 6;

7 * x + 3 = 24;

7 * x = 24 - 3;

7 * x = 21;

x = 21 / 7;

x = 3.

5) (10 * x - 27) * 5 = 15;

10 * x - 27 = 15 / 5;

10 * x - 27 = 3;

10 * x = 3 + 27;

10 * x = 30;

x = 30 / 10;

x = 3.

6) (8 * x + 3) / 7 = 5;

8 * x + 3 = 5 * 7;

8 * x + 3 = 35;

8 * x = 35 - 3;

8 * x = 32;

x = 32 / 8;

x = 4.