7(1-2х)+3(х-4)=6

7 * (1 - 2х) + 3 * (х - 4) = 6;

7 - 14х + 3х - 12 = 6;

- 11х - 5 = 6;

- 11х = 6 + 5;

- 11х = 11;

- х = 11 : 11;

- х = 1;

- х * (- 1) = 1 * (- 1);

х = - 1;

7 * (1 - 2 * (- 1)) + 3 * ((- 1) - 4) = 6;

7 * (1 + 2) + 3 * (- 5) = 6;

7 * 3 - 15 = 6;

21 - 15 = 6;

6 = 6.